The "mandated" switch to HDTV is a farce. Everyone in the industry knows that it won't happen because the broadcast stations have NOT and will NOT upgrade their signals to all-digital in the next five years. It was far too optimistic of a timeline when it was introduced and is all but dead at this point. I just read an article in Popular Mechanics which addressed the issue.
Besides, those TVs are DAMN expensive. I worried about dropping $300 on my current set, but $3000??? You have to be kidding me. They aren't exactly selling like mad, either and not just for price considerations (why buy a TV when there's no signal for it?).
DVDs are wonderful (just set up my player and receiver tonight -- woohoo!!!!), and I agree with BoberFett -- they have at least ten years in them. Perhaps after another five or so, when some form of HDTV is being adopted, another format will arrive to enable greater utilization of the higher resolution (probably similar technology [optical], just higher storage capacity). As it is, new players come out all the time with newer features that make the old ones obsolete. That's why I only spent the bare minimum on a decent player (Panasonic DVDRV30, after rebate $100 with various discounts) rather than dropping $500+ on something with a digital decoder and progressive scan (useless for my TV), etc. Next year there will something else out even more expensive than the progressive scan ones.
As for DVD-R, don't underestimate the power of the media industry to kill a technology. Anyone have a digital tape deck at home?