Trading Russell Wilson would not just hurt the Seattle Seahawks on the field, it would also put a strain on the salary-cap situation.
As Mike Florio of Pro Football Talk noted, the Seahawks would take on $39 million in dead cap if he is traded before June 1. This number is split for a post-June 1 trade, with $13 million going on the 2021 cap and $26 million counting toward 2022.
With Wilson counting toward a $32 million cap hit in 2021 if he remains on the team, there isn't much incentive to move him.