The D800 is 36 megapixels, if we ever hit 50 megapixels then it might be very possible for a Lytro camera to be 15MP or so. That's perfectly acceptable, resolution-wise. The current DoF of the lens is limited by the fact that it's a superzoom, which trades off aperture for focal length. Considering that they capture the entire light field, a traditional 24-70mm might very well be effectively faster than the f/2 superzoom they currently have, giving us a f/1.4 DoF and brightness.
EDIT: I wonder if there are any stop-motion animators who have tried working with this camera.
Another use-case I've heard about was wedding photographers using depth of field as a Ken Burns-like effect for videography or on their webpage.
Both are narrow use-cases, but I too find the technology fascinating and hope it finds a sustainable use-case.
But the subject is still moving quickly - the Lytro can't compensate for that.
Dark, high movement indoor scenes (dancing, sports, etc) are always some of the toughest situations to shoot in, and are probably one of the times where gear can make a substantial difference between getting a "passable" shot and getting a completely unusable one.
Stop down as much as you can, zone focus, push the ISO up to maintain the minimum shutter for the activity at hand and shoot. You can get push ISO higher if you're not looking to print big (as in, 16x20" and up) too, which can help give you more breathing room.
(Of course a 4MP image will not be as good as a real cameras, but low-light performance should be reasonable with that aperture - though I've not seen anything mentioned about ISO ranges.)
I will go hug my 70-200 f/2.8 now, it truely is an amazing lens :)
-- 1: http://imaging.nikon.com/lineup/lens/singlefocal/Telephoto/a... 2: https://www.flickr.com/photos/djkianoosh/sets/72157644825335...