He'll get market value. Look at the money Lamar Jackson and Kyler Murray are getting. And those two in the playoffs make Dak's postseason stats look Hall of Fame worthy. Let me add Trevor Lawrence too. He's won one playoff game, and he did his best to lose it with four interceptions.
At this point you either pay your quarterback market value or you blow it up and rebuild. The Cowboys should just pay Dak. If they want to cut him in the future, just do it. Then the team can crater and they can get the top five pick to replace him.
People can hate Dak all they want, but they are winning too many games with him next year to be in position to draft his replacement.