I think you are right that one of them will likely end up being the Bills QB. Even if Fitz plays well for the rest of the year, I think this is the year Buddy drafts a quarterback to start grooming under Fitz. If Fitz sucks, well then they have to bring somebody in for obvious reasons.
The scary thing is, according to most experts, Barkley is the best QB in this class. He doesn't look very good to me on the football field for an elite QB. He certainly is no Peyton Manning or Tom Brady. Also, I know he is still just a kid but he does not have the personality traits necessary for a true franchise quarterback. He is not very well spoken. He is not a natural leader.
It sucks, but the Bills are likely going to draft one of these guys. If Barkley is really the best, we're in trouble. If there is a better one from the bunch who can truly blossom, let's hope we find him. I certainly don't want a Jake Locker or a Blaine Gabbert ruining our hopes for another three years. I seriously can't take much more.
I pray to God Fitz is good this year and then we can take our time identifying our future QB and grooming him.