I don't, but I know as a fan I've sit back and watch Brock Osweiler, Matt Flynn, Kevin Kolb, Mike Glennon among other fail miserably who come to mind. I would challenge anyone to name someone who has came from being a back up QB to a capable starter who is now starting on an NFL team and has been for a few years. The only guy I could legitimately think of is Tyrod Taylor.
I probably should have said that there's probably a study out there of something of that nature, but just looking at the current landscape there's a pretty good chance a McCarron signing would be a big bust here.