No. Several reasons:
1. Too young, needs more experience.
2. Former quarterback. Former quarterbacks don't win SBs in the NFL very often. Look at the most successful NFL coaches - Landry, Noll, Belichick, Johnson, Parcells. Defensive guys, especially former NFL players who became head coaches.
3. Jerry threw him under the bus when McCarthy was the coach. How do we know he won't intentionally fail in critical moments just to get back at Jerry?
He wouldn't lose credibility if that was the case, who's been ultra successful with Jerry post-Jimmy? Nobody, so he'll get a pass when considered for another team.
4. He basically ignored the running game when he was the OC at Dallas, sure the Eagles ran the ball this year a lot, but they had Barkley, a super running back, don't trust Kellen to run the ball effectively with a less than top back.
5. Lastly, there are better choices out there - coaches with better resumes, more able to deal with Jerry, more capable at relating to the players.
Just no on Kellen. Nothing against him personally, he's a decent enough coach from what we've seen, just not a good fit for my Cowboys...