For me it's more about the use I will get from it. I have already 5 large flat panels in my home. I have my own TV room that would be better suited for a projector than would my home office, however my plan there is to upgrade to a larger flat panel ("75"+) that's got the refresh rate and resolution that I want, and then I can use the wireless cable transmitter/receiver setup to avoid any more cable runs in my home (got way too many already). I'm still a bit old school, I like nice woodwork in TV consoles/stands and such, and to keep my components hidden as much as possible.
I've seen the smaller projectors used for laptops and such, those are cool. I might end up with one of those since the wall I want to project to only has about 100" available before it gets to my raised dual monitors. I could lower the monitors but I like my custom stand. 1st world problems.