The dominos that would have fallen would have been astounding.
Brady would have lost yet another SB. Wilson would be the heir apparent (irony in that trying to keep Lynch from getting shine would have elevated Wilson).
The problems with Wilson getting distracted by offfield projects would have happened sooner.
Brady would no longer be looked at as the greatest of all time.
The LOB would have been historic, and we probably would not have made that stupid trade that shortened Lynch's time here. (He would have made it only one more year though).
We probably go to the next SB, because that was one of the weakest SBs in history. Which means we face and destroy the Broncos again.
The Seahawks become a legacy team and Carroll is elevated to Bill B status.
The LOB implodes, the team goes all in on Wilson (and fails like it did here anyway), and Lynch leaves after that next SB win.
Wilson is elevated to Joe Montana status and we see his merch everywhere, and it becomes a huge issue when he decides not to extend here but to go to another team.
(Rumor from his camp would be he wanted to show he can take 2 teams to the SB to earn the label as the greatest of all time)
That Seahawks team would go down as a legacy team like those Cowboys teams or those Steelers teams. Meanwhile the Patriots are a mere footnote. Brady is looked as washed and not even close to the conversation of greatest QBs ever.