The filming of House on a DSLR was a gimmick, probably funded by Canon. If you watch the show people go out of focus at awkward times, there are awkward cuts to compensate for the out of focus shots. When TV shows actually start using DSLRs on a regular basis, then I'll believe it was something more than a gimmick. Right now, they're an inadequate tool for that.
At best, the filmers of House had to basically turn their SLR into a video camera, adding a followfocus, a steadycam, a loupe. It's ridiculous the costs and the things you have to do to make it work.
And don't go selling your T1i and camcorder and get a 7D. Many of the problems with the T1i and video are also wrong with the 7D.
In order to make video work well with an SLR and its shallow DOF, you need to direct the video participants to stay in one spot and/or move at a certain rate so manual focus is easier. This is possible with a TV show, but not when you're filming your kids.
Yes, the quality of the video can be good, as long as you enjoy frequently out of focus subjects.
For documentary video, a camcorder is still the best thing. Maybe 5 years down the road things will change, once continuous autofocus and silent focusing lenses are the norm, but right now, video in SLR is an infant. And don't believe me. Vincent Laforet, a pro DSLR videographer says the same thing. Go here and watch some of the free videos posted.
http://creativelive.com/courses/vince_laforet/ . (You may need Firefox to view them).