He's not a franchise QB. When you have receivers open all over the field (High School offense or not), and you can't find one...you are not the guy. This explains his terrible TD to pick ratio in college and now here. He can't read defenses well and he ends up just flinging it. And because he's aware of this he then reverts to being conservative and breaks the pocket to run.
The rumor from Ian "PaRappa the Bulllshit Rapper" Rapoport is that they are bringing in Tannehill to pair him with Smith. I don't have that much faith in the Steelers FO. Not that Tanny is the answer either, but I would see it at least as a move to try and accomplish something with TJ and the D we have now.
Going with Mason and Kenny is just asking for more of the same. Mason has a ceiling we've all seen don't be fooled by the two games against bad teams. Speaking of Mason the Tannehill rumor may just be a ploy to get him to sign. Mason of course could also be playing that game by saying he's "interested in a fresh start" blah, blah. Dude would be stupid to go somewhere else unless someone is dumb enough to give him way more money than he is worth as going that route probably means he's done in the NFL in a few years. He's a backup....be a backup. Think Charlie Batch...the long game. And Mitch is done...enough said.
Tanny is familiar with Smith...he's getting long in the tooth, but with the right parts around him he can get you to and win in the playoffs. Familiarity with Smith and his offense is a BIG +. Again I'll believe it when I see it from Art, Mikey ,and the Keystone Cops " Steelers Way" the front office swears by.