There are a number of articles out there showing that sinking lots of money into the QB position more often than not does not translate into success. The below USA Today article highlights an analysis showing that there is no correlation between paying top dollar for QB and wins. It makes intuitive sense since any team paying through the nose cannot invest in other positions needed to field a solid team.
https://ftw.usatoday.com/2018/02/nfl-quarterback-salaries-salary-cap-kirk-cousins-free-agency
You may have a shiny pricey QB toy but if the rest of the team is average, its not easy to win consistently. Just take a look at Green Bay, Atlanta, Ravens, Lions, etc. While the one team that is consistently winning --New England--isn't spending disproportionate amounts on the QB....
With all the money that Seattle is now tying up in Russell Wilson, they have that much less to shore up defense, run game etc. And I expect that Seattle will not be very relevant in the NFC SB hunt anytime soon.