Nuclear is not a palatable political solution for a lot of people and it is easily simpler to reject the proliferation of such materials. The current 'theater' from a geopolitical standpoint for nuclear is China and it does not appear to be succeeding well. I don't expect France to succeed given all that has occurred.

Smaller nuclear devices will need constant care and monitoring that it is highly likely people will need to 'grow with' such devices. I dont think the will UN back something without a proof of concept which could delay adoption years.