I am pretty sure that right now nobody on this board knows about what will happen with Bennett next season.
It seems he has the talent to be a good backup but what his problem/injury is has been kept pretty quiet.
We know McVay has talked to him a few times and says he is doing good.
Other than that we don't know crap. We can speculate all we want and postulate what this all means for his future with the Rams but let's be frank we do so from a position of ignorance as we don't really have much information to go on.
Right now all we can do is wish the guy get's well and hope that he has a bright future.