Thanks everyone for the excellent discussion.
To me 5 years at $175M is absurd even though I agree his effect on his teammates is valuable. In 10 years in MLB he has been on the All-Star team 3 times, has one Gold Glove, and had by far his best season in 2019, 6 years ago.
Right now he's easily the highest paid player on the team with the 6th highest WAR on the team. Crochet, Chapman, Duran, Story, and Rafaela all have higher WAR's--primarily, I hasten to add, because they stayed healthy.
And then there's The Kid, Anthony, whose WAR in 71 games is 3.1 compared to Bregman's 3.3 in 99 games. Anthony's 10 years younger and just signed for $130M for 8 years. One could almost argue that Anthony's contract, including whatever bonuses he earns, makes a sweet contract for Bregman possible.
FWIW, I think the real strength of the 2025 Sox is the pitching staff, and I doubt that Bregman has much wisdom to pass along to them--and they're half the team.
I think Mayer would be a pretty decent replacement for Bregman.