I saw Kaep destroy Green Bay single handedly (well not alone but he was a good part of it) in the SB run they had. If he can get a coach that can lead him away from read option to a decent hybrid spread, I think all this regressing talk will cease.
A QB of any race needs a decent team around him. All pieces have to be at least decent. Can't have good WR's with no line that will give you the time to get the ball to them or allow you to wait for them to break contain. Can't have a good line with receivers with no heart or hands.
The 49ers have been forced to rebuild early, and their smartest investment is to bench Kaep so he doesn't get injured, so they won't be forced into moves they're not ready for. Kaep is not the blame for what's going on, so he's just going to have to work on his game and ignore doubters, while letting Gabbert become trade bait.