If Flacco improves, could Caldwell replace Cam in 2013?
I've been hearing some good things about Flacco looking sharp in OTAs and minicamp (while he was there). Obviously you need to take that with a grain of salt, but maybe Caldwell is a good partner for Flacco.
It strikes me that if Flacco looks significantly better this season there could be temptation to replace Cam with Cladwell. At a minimum I'm sure we'd have some fans asking for it.
Of course, if Flacco does well that may reduce the heat on Cam anyway, so it's a bit of a catch-22.
As far as Caldwell's qualifications, I believe he's mostly been a QB coach before being head coach for the Colts. I would think that's enough if you're unhappy with Cam.