I was listening to the Leadoff Spot on MLB Network a few days ago, and there was a Red Sox fan calling about how he thought they should do anything in their power to acquire Votto. Steve Phillips and CJ Nitkowski both stated they highly doubted Votto would waive his no trade clause, but if he did, the Red Sox would have to be willing to give up both Betts and Devers.
I'd rather not deal Votto, and the Sox probably wouldn't want to give up a package like that, but if they were truly willing to do this, that'd be awfully tough to turn down.