mmm - I work in VFX, so I'm not against technology obviously, but you can leave too much to the cutting room sometimes.
There's a possibility of wresting control away from the director with this and the suits from movie studios locking out the principals to create their own edit.
Look at something like Die Hard - John McTiernan shot that all in camera (i.e virtually no coverage) and look how that turned out - Spielberg often does too.
Then look at the middle episodes of the Star Wars series, where Lucas has the tech to cherry pick performances and comp them together, i.m.h.o a pretty sterile way to approach a movie.
Cameras might eventually get to the point where you won't have to bother to expose or even focus them correctly, perhaps in the future film crews could just stick a camera in the middle of the action, and let the actors get on with it while they go to lunch :-)