Dak is a good qb, but he’s not transcendently great. When you overpay him, he’s not good enough to drag along a mediocre team with him to glory without the pieces that they can’t afford after giving him too much. He needs a good o-line, an elite running back, and a solid defense. Where does the money come to pay for that when he’s making what he’s making?
You’re right, 60% is probably low. 50% of the country are democrats, and it’s gotta be more than 1 in 5 republicans that doesn’t like him, either. Most of them will still vote for him, but that’s a different matter.