I think the Pats would’ve put up a better fight than the Broncos did, but it’s hard to say they’d have beaten the Seahawks, who were playing lights out ball. Even when the Pats get completely dominated, they don’t get blown out. See 2011’s eight-point loss to the Steelers as a prime example.
The Pats also put up 475 yards of offense on Seattle in 2012, in Seattle. Granted they were a far different offense in 2013 but that at least shows that Brady and Belichick had an understanding of Seattle’s defensive scheme and were able to exploit it at least that one time.
Could they have done that again with the pieces they had by the end of last year? Probably not. But I don’t think we’d have seen the kind of implosion from the Pats that we saw out of the Broncos. They’re just not that kind of team under BB.