I think many Canon DSLRs (T2i, T3i, 60D, 7D, 5DmkII, and one of the 1Dsomething) can beat pretty much any camcorder in image quality. On the other hand, even a 200$ camcorder would probably be easier to handle, so it depends how much effort you are willing to put into it.
I wouldn't say it can beat any
camcorder but even for the camcorders a video capable DSLR is technically superior to, that better quality doesn't come out of the box - like you said, you have to spend a lot of time practising with a video capable DSLR to get really fantastic results - the arguably less practical focusing of such DSLRs puts them at a disadvantage against most camcorders, especially for subjects than frequently and quickly move out of the DoF. Sometimes, an easier to use product can deliver better results.
A lot of Hollywood producers are making the move towards HDSLRs, because the image turns out better than their million dollar video cameras.
I don't think I could disagree with you more on that. There are camcorders that have larger image sensors and can shoot in a much higher resolution such as 4k camcorders, not to mention at higher bit rates. The most likely reason why some filmmakers opt for video-capable DSLRs is that they arguably offer a better compromise between price and video quality.