While you guys are arguing about 10 wins and championship-caliber QB play, the coaches and players are trying to figure out how to rebound from losing to a mediocre team they were picked to beat by three scores.
Buechele is the QB because he's accurate, experienced (relative to the competition), mostly poised and can generally execute the passing concepts, as we saw in the spring game and more often than critics care to admit during actual games. Personally, I think Ehlinger can come close to matching his poise and a little less close to matching his accuracy, but he can't match his experience or, if the spring game is any indication, his ability to execute the passing game. That may have changed since April, but none of us know.
Heard can't match Buechele in any of those areas. He's a much better runner. How well do you expect him to run when there's no threat through the air and his offensive line is getting pushed around? You might start by watching the 2015 Iowa State game.
There are a lot of problems to fix. It's easy to start by blaming the QB because most people watch the ball, and he's usually got the ball. Getting the offensive line to give a damn, teaching the backs to identify holes, or injecting some creativity into the playcalling would do much, much more for the offensive production of this team than taking the passer off the field for a wide receiver playing running back.