No one will ever challenge Tom Brady as the GOAT.
Certainly not worth passing on tens of millions of dollars annually to try and do something one human has ever been capable of doing.
You take as much money as you possibly can over as short a period as you can.
And win or lose, the NFL franchises will continue to grow in value exponentially, so there’s really no sense in giving up equity stakes in the franchise or other businesses.
Ultimately yes, because the players want to know they are getting their money, in case of injury.
As for the GOAT debate.. probably. But if Mahomes decides he wants to play for 20 years and stays healthy.. a 2nd ring here would be a start down the path. I don't think he HAS to have 7 rings to be on the same level as Brady, but he needs 5 or 6.. and that's still an immense hill to climb in a salary cap era.
FWIW, the extra game a year is going to allow lots of QBs to break records. Brady got the benefit of playing in the 2000's and 2010's which offered a lot more QB protection than say the 80's.. well, now QBs are even MORE protected, and will have easier opportunities to stay healthy, upright, and throw for more yards in a season.