Patrick from ballotlines has updated his predictions about who would have the House if some of the seats were decided by popular vote within the state. This time he included the potential voters who didn't vote because the races they had available were uncontested or otherwise not representative.
I always find it interesting to ponder the effects of changes like these on results. Most of my job for the last few years centered on a project that tried to change behavior of employees by changing the system they were working in. It's a fascinating thought project.
I suspect that this fear of the unknown is why we stick with an election system most people barely understand. My guess is both political parties 9or at least their consultants) prefer small tweaks to the existing rules than a major overhaul to the whole operation.