If there was a simple "Rollback to Previous OS Version" button available, I would push it without a second thought. Now would I be willing to wipe my N4 and reload it from some downloaded 4.2.2 backup image that some anonymous person uploaded to a sketchy side loading website? Probably not. Other than a bit of extra standby time, I haven't noticed any meaningful differences between 4.2.2 and 4.3. And since I rarely ever dropped below 50% battery while on 4.2.2, the difference between the two is insignificant to me. Except for the fact that MLB At Bat video worked on 4.2.2 and doesn't work on 4.3.
As far as waiting for an update goes, I have my doubts that is going to happen anytime soon. I've been an MLB.TV premium subscriber for the past couple of years, and let's just say that in season bug fixes and software updates do not seem to be a very high priority for MLB. I personally would be happy if they just got the video fixed by the end of August, but I am not holding my breath. If you put a gun to my head today and asked me if they would have it fixed at any point this season, I would have to say no. But that's just my opinion, hopefully they will prove me wrong.