Right. The bulb issue is just a fact of life...the cost of doing business. It's more of an inconvenience if the bulb isn't readily available than the $200 it costs.
I can't imagine that the light engine technology would matter for bulb life, except that DLPs have moving parts, moving parts are difficult to do without some physical vibration, and vibration can shorten filament life, but then maybe it really can't. I would base my choice on the other factors other than bulb life.
I have a theory that if you have a Sony GW and use it only on "power save" mode which burns the lamp at 100w instead of its rated 132w, that this might extend bulb life significantly, or at least that's what I keep telling myself :D . I know dimming a conventional incandescent bulb can make it last a very long time, anyway, but I'm not sure that transfers to RP lamps. I'm 10+ months in at about 6+ hours a day, so I should have an answer to that at some point in the next few months (weeks...days). This also improves black response without sacrificing brightness. I assume that other vendors also have a similar feature.
There's no place like 127.0.0.1