I don't agree with a lot of people here that Mahomes needs to win 8 championships to surpass Brady like that's the only way he can do it. And I don't agree that this Super Bowl result means the door is shut.
I've always said - and I know others here have also said - I'm open to discussing someone else being the GOAT over Brady even if that guy didn't win as many championships.
But here's what happens: Packers/Colts/Saints fans start making an argument like "If Peyton/Aaron/Luck/Brees wins 6 MVP awards and 5 Super Bowls with this inferior franchise, he'll be the GOAT!" and then use that theoretical argument to diminish Super Bowls as a team stat and not an invididual one. None of these QBs actually win anything. They fail in the biggest moments time after time. Their individual stats are boosted by high paid skill players that don't help them win.
In another thread, I just posted a ridiculous list of quarterbacks that Brady has beaten in the postseason; his career is so dominant it's really hard to find a comparison in the expansion era. Outside of Peyton Manning, he is 17-0 against other elite (or once elite) QBs: Mahomes, Rodgers, Warner, Wilson, Brees, Luck, Roethlisberger, Ryan, Rivers, McNair, Gannon, McNabb. I mean, how nuts is that? Sure, he has sometimes had the better roster. Sometimes the better coaching. Sometime more luck. But certainly not always and not to the degree that hindsight changes the narrative.
So here's my convoluted point: most accomplished, greatest, and best are one in the same. And that's what really drives me nuts about these hot takes from the media. Brady is the most accomplished because he has been the best, almost always. And if Rodgers, Brees, Manning, etc. had really been the best, they would have a lot more accomplishments. But they weren't. Not even close.
So can Mahomes reach or surpass Brady? Sure he can. It isn't about counting numbers like "how many championships and MVPs". Sure, those help as an indicator, but it's about being the best and dominating, beating all of your contemporaries for many years and being the clear cut best quarterback, and playing your best year after year through all the adversity, down years, disappointments, and capitlizing when you can, over and over.
If Mahomes can do that and be the very best quarterback in the league and adapt to all kinds of different circumstances, then fifteen years from now, maybe he doesn't have eight championships but he has a lot of them and a lot of legacy moments, then I'm sure open to discussing it. But from a Patriots/Brady fan standpoint, we've seen a lot of these beginnings before and all the hype and theoreticals and counting trophies in advance, and frankly no one at all has done anything to even put them in the same class as Brady (or a bunch of other all-time great QBs in league history.)