Your right, but so is Gan. If Romo had the ability, much less the durability, to get you there it would have happened a long time ago. This is about the Cowboys future, more than anything else. If you ever want another ring, its vital you get Dak (who is the guy of the future) to go through the playoff ringer and experience that so that next year, when you likely are legitimate SB winner favorites, he has that experience. I know this as Packer fans had to learn this very harsh lesson with Favre (who I still root for) having to go for the team to get back and Favre had a hell of a lot more left in the tank than Romo does now when they cut him loose.
Look, either way you are not likely getting a title this year (if the G men can figure out Dak, I am sure Bellicheat can in his sleep underwater with the lights off), but you can likely get some real trade value from some struggling team out there and get some real playoff experience under his belt. Or, you can put Romo in and watch him be one and done and basically turn Dak into another Wentz or Brock Lobster who isn't going to progress because you shit on the team chemistry you have been building and Romo likely gets hurt again and only the Browns or Jags will even want him.