DLP is hardly dead. DLP is the king of front projection and basically dominates the entry level front projection market as well as having a ton of products all across the board and is a major player in digital cinemas. Almost guaranteed that the last time you went to a movie theater that was digital, you were looking at a DLP projector.
The thing is that DLP rear projection televisions, much like LCD rear projection televisions, LCoS rear projection television, and yes, CRT rear projection television, were all at a major disadvantage in rooms with bright light. They just couldn't compete with bright lights. So, even though they could reach some crazy sizes, like 60" diagonal or even larger. I think Mitsubishi had an 82" or so DLP rear projection unit... But, at the end of the day, these things weren't very bright. CRT televisions were brighter, but were size limited and heavy as balls.
So, when flat panel displays started on the market... well, it didn't mean much. A 50" NEC plasma display was well over $10,000. Compared to a sub $5,000 60" DLP rear projection. Pretty clear who the winner was. But, when flat panels started dropping in price and a 50" plasma was $3,000 the game started to change. There were tons of rear projection TVs on the market, but when people went to buy new, it wasn't rear projection they were looking at but plasma television. Then pricing really started to bottom out and the LCD display began rolling out to market. These displays were thinner and were getting lighter and lighter which made shipping easier as well as installation.
Lamps aren't really a major issue with many of these companies. You quite realistically should be able to get replacement lamps for years and years to come, but over time, the rest of the electronics will most certainly fail. Projectors have fans and other moving parts that will fail over time. The projectors also generate a fair bit of heat which eventually damage the internals. Count on it.
A DLP, LCD, or LCoS rear projection television could very well work, and people are definitely getting rid of them as they buy brand new projectors, but for those looking for a nice big HDTV, then it could be quite a score for zero cost. But, it really does ask to be used in a darker room.