Every NFL-level player has got their value. If Dak would play for $5M a year, I bet we could make it to a Super Bowl. People don't like our RBs or our LBs or whatever... know what $50M in free agents could do for us right now?
The real question is if Dak is worth $60M a year, and I don't think he is.
I've said it before in other threads, but I think the QB market is in the same place today where the RB market was 10 years ago. If you at the last several top-dollar contracts given to good but not great QBs, I don't think you will see many teams walking away happy at the end of the contract. The Vikings paying Kirk Cousins got them nowhere, the Cardinals have done nothing with Kyler Murray, LOL at Daniel Jones, look at Ryan Tannehill, etc. It was like back when RBs like Todd Gurley and DeMarco Murray got big deals. Almost every team that signed those guys ended up regretting it 4 years later, and then eventually, the league learned to stop paying them.
I have no doubt that Dak could get $55M to $60M on the open market. Absolutely no question. But will the team that pays him that much walk away happy 4 years later? I doubt they will, so I hope that team isn't us.