Dak is untradeable and uncuttable until 2024: https://www.spotrac.com/nfl/dallas-cowboys/dak-prescott-19089/
$89M of dead cap in 2023 would destroy this team. I'm not even sure they could handle the $39M in 2024, at least not without seriously hollowing out the team or having a stellar draft/a lot more people step up.

As much as I'd love to see them move on to a better QB, they've dug too deep a hole with Dak's contract. And, that's assuming a lot that Cooper Rush is that QB. During camp and the preseason, he was arguably the third or fourth-best QB on the team. Grier looked at least as good. DiNucci, who isn't even on the team at all, looked much better than both of them in the games, albeit against weaker players, but also with weaker players helping him. He looked more decisive, got the ball out quicker, and was better at making plays with his legs.

They're not going to let a $40M QB sit on the bench as a backup, and they can't get free of him for at least another year. Dak will play as soon as he's healthy. The bright side of Rush is they may not have to rush him back before then. It would be nice to have a real QB competition for once.