I don't think any GM is allowed to trade a starting position player for a reliever unless he's the last piece in a title run... even trading minor league starting position players for bullpen help is too risky (cough, Gleybar Torres).
There may even be an adage against trading for starting pitchers, since they're all one elbow tweak away from anchors you can't drop. I do think Cleveland will trade Lindor, though, as he becomes their own Betts' situation (hey, Boston: that's Cleveland, as in mid-market franchise...)
Regarding Bogaerts, how would diehard Sox fans feel about him if he didn't want to opt out after a few more years in suckitude? Sure, he's already got two rings and he loves Boston, but as much as we love him, do we really want a leader who's complacent? Can we realistically expect anyone in his prime to have the fire to gut it out and fly the phoenix out the ashes?