Economic sanctions, if China would step out of the way and allow them to become effective, would erode the North Korea people's tolerance for their entitled, immature, rich "leader". The purpose of sanctions has always been to cause revolt. And now that Trump has forced China to remove the lifeline they've been extending to Kim, maybe the sanctions will finally work.
OTOH, when sanctions start working, Kim will feel threatened. And then the nuclear arsenal that past US presidents have allowed Kim to build will become a problem.
Stop him now at a high cost, or he'll eventually plunge the world into global war, at a much higher cost.
Ask the pussy Neville Chamberlain, and his modern day pussy counterpart, Barack Obama. And then ask Winston Churchill. Should the bully be stopped now, or should we pacify him and declare "Peace with Honor"?