Of anyone on Bones, David Boreanaz is actually the cast member fans might guess would be a holdout for a future season (or whatever).
And when Bones did get renewed for Season 12, its last year, it didn’t seem like Boreanaz was going to be fighting for anything more, especially after he, co-star Emily Deschanel and others dropped a lawsuit on Bones over financial disputes.
Whenever Season 11 debuted with Booth’s disappearance, the actor’s comments in interviews made it seems like he was either leaving the show after that year, or that the show was going to be ending anyway.