First, his path to a major league rotation spot is blocked for the foreseeable future. He’s behind a good 7/8 guys and there are more guys that will be passing him in the near future.
Second, his trade value is now pretty much tarnished until he shows himself to be a useful major leaguer. The best path for him is seeing if he can respond positively to pitching in relief and eventually doing so at the major league level.