This is getting absurd. Those people who can't through Molten Core will simply get bored and stop playing, rather than continually bash their heads against a wall for two years.
Ah, that explains why WoW was a failure, and people quit in droves during vanilla. Oh wait, that didn't happen. Reality completely contradicts your theory.
What people actually did, if they were having problems in Molten Core:
ZG, or AQ20, or Dire Maul even (as far as 5 man dungeons it was very hard at release, and offered some very strong blue gear), or ran regular 5 man dungeons to collect some of the remaining upgrades they might need, or worked the tier "1.5" quest line, which was arguably a harder than molten core, but didn't require more than 10 players for any part of it. Or they focused on crafting, or class quests.
The difference between now and then, you see, is that now LFR, or PvP, or collecting badge gear trumps everything else.
So would the top guilds be satisfied with continually raiding Naxx 40 for the rest of their WoW days, or would they begin demanding new content?
Please follow the thread. For one thing, I've said an occasional gear reset during an expansion is okay, every 2-4 years, not nearly as bad as a reset every 5 months. For another, you can always add new content without making it easier than the previous tier.
As I said above, those players who can't get past those earlier raids will eventually get bored and go elsewhere.
In reality, this didn't happen. In reality, players are getting bored and going elsewhere today, with easy mode LFR raids released each patch.
Your theory is wrong, and you should feel bad.
No, the market agrees with me. WoW was, from the very start of its life, the most casual and easy MMO. It was very popular as a result.
WoW, at the start of it's life, didn't have your precious LFR. Your theory that lack of it would kill the player base has been proven wrong. Only in a reality distortion field does the market agree with you.
Any game or product experiences the most growth in the beginning as it is starting from zero.
WoW is still an incredible success.
http://massively.joystiq.com/2012/02/29/blizzard-announces-layoffs-of-600-employees-worldwide/
Why don't you ask those 600 employees how successful they feel right now?
It isn't an analogy. Look up the word, you really should know things like this if you are a professional writer.
An analogy is when you take an outside example, like if I was using a car example. I am giving you a counter example of something else inside the same game, and asking if your logic applies there as well. Obviously it doesn't, your logic is flawed. In a broad game such as WoW, even if something only applies to 10% of the player base it can still be a worthy thing.