So far, all that has happened is Devers saying he won't change positions. IIRC he also said he wouldn't give up 3B in spring training, but that obviously is what ended up happening. And Cora's quotes don't make it sound like they've moved beyond anything other than asking "what if?" at this point.
But what if the team really forced the issue and ordered him to play 1B? Like, they officially submitted a lineup card with him playing there. What is their recourse if he refused that? Is there a precedent for this? Could that be grounds for terminating his contract? He's owed a lot of money through 2033.
While Devers is coming across as a real selfish knob here, there is a kernel of truth to what he's saying. Any potential positional flexibility should be sorted out and planned for in the spring, including contingencies for injuries. Don't tell a player to put away their glove if there are scenarios where he'll need it. The "put your glove away" speech should be reserved for late-stage Jim Thome/Nelson Cruz types where there really isn't a chance they'd ever see the field. So the Red Sox have helped exacerbate this issue to some degree.