That's not a good reason to stay away from DLP HDTVs. That's a good reason to factor the price of replacement bulbs every 2-3 years into the cost of your television. I saved about $2000 by going with a DLP in June 2006, and have yet to replace the bulb -- I spent an extra $180 at the time so that my second bulb could sit next to my television for the last two and a half years. So it'll take at least thirty years for my decision to go with DLP to turn into a bad one, at least in that regard.
DLP is a good option for folks who don't need the flatness of a flat screen, and want to get a lot larger display for the money. As much as LCDs and plasma HDTVs have come down in price in recent years, the break-even point been drastically reduced. My next television probably will be a LCD or plasma, but DLP still remains a good choice for folks who are aiming for the very largest living room display sizes.