Yep....neither China nor any in Asia want to see the collapse but I am not so sure it can be prevented with all considered. Is China massing anything more on their borders now? If they start to move, which might be their call in what N.Korea is doing now, then they will be the first to attempt a power Grab...with S. Korea right behind if not along side to do the same.
Yea, the last thing China wants is a unified Korea under the command of Seoul because that could potentially mean US soldiers on or near their border, so we can’t discount a power grab by China in the event of a NORK govt collapse.