I think the team is very clearly better for the next year or two by doing that.
The Giants would make sense as a trading partner for Pillar. The Cubs might too as he'd be an upgrade over Almora probably, but they already have a bit of an outfield glut. Cleveland makes sense, but there's no way they'd do it for Salazar. Maybe to the Royals for someone like Jake Junis? Maybe to the Pirates for Nova?
The Braves could be a good destination for Pearce. Pearce seems like the kind of guy Seattle would target for CF...