only if we give up a stud prospect. if not, then he can walk and it won't hurt as bad as you think. we'll get two picks, which will be in good spots. Boras won't let him sign until after the season so there's nothing we can do about that, but I'd rather let him walk than give him an extremely long and expensive deal. Time will tell.
and losing him without giving up top specs doesn't hurt the rebuild at all. they'll still be good after he leaves...if he leaves.