This is a serious question and I'm hoping I can get a serious answer. I don't understand why plasma is not as successful as LCD/LEDs. I mean, anyone that goes into a Best Buy or other electronic shop and look at the LCDs on display can see that a lot of what's showing looks like some type of post-production edit. The quality is incomparable to plasma but somehow people are buying these screens. It would make sense if they were cheaper per size but they're not. So, what gives?
Why did Beta lose to VHS? Why did HD-DVD lose to Bluray? The answer to your question isn't simple and there are multiple factors but the shortest version is this: The consumer is (largely) ignorant. That means that marketing, salespeople, word of mouth and a bunch of other factors come into play besides quality and price. Keep in mind that the market has shifted a lot over the last 15 years and what is true today isn't the same as what was true back then.
When Plasma was released it was (and still is) superior in picture. The early Pioneer TVs blew LCD screens and CRTs out of the water. Unfortunately, they were also in the $10k-$15k range and so no one except the very wealthy owned them. They also had a horrible problem with burn-in which still rears its head in the form of image retention and continues to be a "concern" for average consumers despite being a non-issue for the better part of ten years. There are also misconceptions about power use, glare and "refresh rate" that marketing companies (LCD) have used against the technology.
The simple fact is this: if consumers were more educated and put a tiny bit of effort into planning/setup Plasma TVs would be the standard and everyone would own them. Their picture quality, contrast, black levels, colors, accuracy and speed are all superior. Do they have a glass screen? Yes, and if you have direct sunlight they reflect a good amount. However, an LCD with direct sunlight SUCKS TOO, direct sunlight ruins pictures no matter what. So why choose an inferior picture all the time because of reflection some of the time? Especially considering you can choose where to set up your TV, use blinds/curtains or just plain monitor your viewing habits and watch more at night than during the day.
At any rate, I'll leave you with this: I sold TVs for several years before I got a job in IT using my degree, most people I sold to wouldn't have been able to tell the difference between my $5000 Pioneer Elite Kuro and a $500 LG if I set them up in certain ways. Salespeople determine what you buy a large portion of the time, only the most informed consumers are immune and even they can be swayed by an even more informed salesperson. The salespeople in this country (as a whole) are not very informed, most retail "chains" have people who are hourly and are completely untrained. They have no stake in their job and they don't care what you buy as long as you buy something. The few who do (or did) care (like me) are underpaid and overworked and eventually move on for better jobs that will treat them with value. The only place left where you can find good advice from a trained and knowledgeable person is the internet. Forums like this one (and AVS forums) sometimes have people with real knowledge.
Just be careful who you listen to, often the most adamant opinion is the most uninformed one. I trust the professional calibrators over at AVS forums myself, and when I was looking for accurate information to stay up to date that's where I would go. It's sad that Plasma TVs are slowly losing the war, now that Panasonic is dropping their lineup Samsung is the only decent Plasma left on the market...It is a sad time for TVs, I will very likely have to buy a spare set in the next year or two to pack away so that when my Pioneer kicks the bucket I have something else that isn't LCD to fall back on. I can't handle an LCD TV any more than a crappy matte finish on a computer monitor
Edit:
"Plasma" sounds like it could kill you if it leaked.
I dont know. I am well versed in technology and chose LED/LCD over plasma just for weight and price at the time. With some tweaking of settings I can LED/LCD to look exactly the way I want it to. But I am not the average consumer.
On another note, which tech is more green as far as disposing? Is plasma more poisonous in a landfill over led/lcd? I think that could also be a factor.
I don't know when you bought your TV but for more than the past 5 years Plasma has been just as thin/light as LED (which is also LCD) and have been considerably less expensive for the picture quality. You also can't fully calibrate an LCD in the same manner as a Plasma and the limitations of the Liquid Crystal pixels mean that you cannot make the picture as good as a Plasma. It's like comparing a TN panel to an IPS panel, there just isn't any comparison. You say you're not an average consumer? I disagree, you're exactly an average consumer. You don't even know what you're missing because you've never used a properly set-up Plasma TV for any period of time to see the difference. I'm not trying to be confrontational here, I'm just making a point. This is the same discussion I've seen over 120hz vs IPS for gaming. To someone who hasn't extensively used both you won't be able to tell much of a difference because you're just not used to the difference, the same thing happens in audio and other hobbies.
The people who are extremely informed generally all go the same route for a reason, if you don't, that's fine. If you're happy, I'm glad you're happy. But don't sit here and say something completely subjective like "I can tweak my LED/LCD to look exactly the way I want" when that statement does nothing but show that you're not well versed in the technology and you are an average consumer. It's very contradictory. If you were well versed and not average you'd own a Plasma and have it professionally calibrated.
99% of the people I sold TVs to had no idea what their TV "should" look like. They didn't know there was a standard for picture quality similar to the "THX" audio standard, they don't know that when a movie/TV producer shoots video they use a standard for what it is supposed to look like. The people who let me help calibrate their sets (often Samsung 7000+ series models with unlocked calibration settings similar to the Pioneer Elite models) were amazed at how much better the picture looked once they got used to it. It made my day every time someone came in to the store or called just to tell me how incredible it was that they noticed how bad their friends TVs looked. Most people have their TVs too bright, too saturated and very unnatural with high motion settings (like 120/240hz) that insert too many frames that don't exist in the source (nearly all sources are under 30fps).