If Dak get's a new contract which pays him like the Top QB's then he won't be given too much margin for error with the fans.
Being a 4th round pick and his ability to right the ship has endured him to the fans. But, now that he will be paid like the top QB's he will be expected to play like one and things that may have been forgiven by fans before won't any more.
It's not that he's overpaid that upsets people, it's the fact that him taking up more and more of the cap space prevents the team from retaining players due to the restraints implemented by the cap.
He will be expected to show that he can carry the team and be the main cog that elevates the team/players to the upper level.
He needs to show that the players he has around him is irrelevant up to a certain point and be able to perform even when he isn't surrounded by top notch players.
Right now he has Zeke, Cooper, and Gallop that are excellent players and help mask a lot of his deficiencies in a lot of instances.
Now, he will be expected to perform even if/when those players go out due to injury.