Kim has made no commitments, except to repatriate the remains of US soldiers killed during the hot phase of the Korean War. He has gained major concessions, including a justification for China to lift its sanctions. And he got the President of the United States to fly to Singapore and take his lumps on the world stage, while praising Kim and elevating him to world stage status. His tactic worked. The chances of him giving it up are less than they were.