In theory, that potential could happen.
In reality, no chance...
As it Rodgers would have to sit on the bench when he could be starting many places, and that the Packers would have to pay him $25 million and turn down trades for the pleasure of having what I assume to be an unhappy QB.
Plus, does he want to coach? Most successful players haven't seemed to turn around into NFL coaching (yes some have, but most don't), and it'd probably drive him mad, thinking he could do it better than the starting QB. Just think of Rodgers attempting to coach Jay Culter the mental side of the game.
And a lot of greats are shitty teachers, as they didn't struggle to do something and find it harder to connect with those that did struggle to do something. I found some of the best teachers are the ones that struggled themselves and then figured it out.