Here is the thing: Is he talented enough that when you need a backup QB to come in and run an offense that he can get you through until the starter comes back?
Instead of trotting out QB's who don't have starts in the NFL and you have treat them with kid gloves why wouldn't you want a guy who has been a successful starter in the league as your backup?
Compared to many of the backups in this league, I believe yes. The league has changed a lot in the last few years and a QB running the ball is becoming more and more acceptable.
If believe if people would look at this in a vacuum, take off the racist and political shaded glasses, and just bring up the facts about stats/talent and ask fans if they would want an experienced, relatively young, QB who has brought his team to the SB, and is athletic enough to muddle through and knows how to prepare for games without many snaps in practice because of his experience they would say yes.
BUT too many people have their vision clouded.
As a steelers fan, going into this year if you asked whom I would rather have as a backup to Rapistburger, Rudolph or Kap (or now Kap or Duck) I would go with Kap.
Please, God, let the Stillers sign Kaep