I assume his agent is telling him whatever is going to net the most money. I assume that is a trade, but since he has the clause could he force an extension or guaranteeing of more years in order to accept the trade? That would be my first play if I were Carr. Doubt he gets a huge contract on the open market. Second option if he is released and unclaimed would be to sign a 1 year prove it deal with stipulation that the franchise tag couldn't be applied. He will have Raider money next year and he could put himself in a position to thrive with a good offense.
If I'm Carr I hope to end up on these teams, in this order: Buccs, Skins, Jets, Titans, Giants. Not sure I'd consider anywhere else on a prove-it deal.