As much as I hate to agree w/ pixelthis...I do not believe that lamp engine technologies will survive much longer other than front projection systems. The constant cost cutting of panels is going to make it very difficult for them to survive.

Other issues to think of:
1. Replacement lamps
2. Sweet spots
3. DLP is an outdated tech compared to LCOS (Sony & JVC). DLP needs to do a 3 chip rear projection to compete w/ LCOS (it is still doing wobulation).

Personally, I believe that rear projection has its days marked. Only due to panels coming down in price and front projection systems becoming more and more popular.