They should just keep Matt Ryan and draft someone to develop behind him.
Ryan is still pretty good and he's given everything to Atlanta.
I think you have to factor in how competitive you are right now, and whether it makes sense to try to be more competitive in the future.
Optimally training a QB behind Ryan sounds great, but is Atlanta in a good position to get a good QB prospect? That said I'd think the compensation for Ryan would probably be my determining factor
Honestly trading Ryan and trading for Baker isn't a bad idea either. At least Baker is 26 and can grow. What's Ryan going to do for you?
Hell if Atlanta can get Baker for the same compensation or less than what they got for Ryan I'd consider that a win for the franchise