1) I've been calling for a third ref to handle video reviews ever since they instituted the video review. This remote video ref idea is actually pretty creative, and it would obviously provide a big cost savings relative to having a third ref on site everywhere. Would seem to work quite well for tournaments, especially, where you could have a video room with feeds from all mats. I'd say it's worth a try. No matter how much integrity a ref has, he has a clear conflict of interest when reviewing his own call, especially if there's a hostile crowd booing him while he does so. People don't like to admit they were wrong. It's probably rarely a conscious thing for the refs, but at some level, that tendency is bound to affect their perception of the video on review.
2) As for both guys getting a breather, this is obviously true, but the point is that the better-conditioned guy doesn't need it, whereas the guy with no gas tank does. In this sense, the guy without the gas tank clearly benefits more than the conditioned guy.