Europe has no energy, very little natural resources, an aging population being replaced by unaligned foreigners, a disfuncional currency, and terrible policy ideas. If the US stops propping them up, the globalists running the place will go quietly into the night and the amazing entrepreneurs, engineers and dreamers still left in Europe can start the project of rebuilding.
Discussion
I think it's more likely that the globalists will do everything they can to whip the populace into line, and doing so will create revolutionary conditions across the continent. By moving our troops to Hungary, Trump gets them out of the way but can have them nearby when we finally have to go back in to end the Europa civil war. It will be then that the entrepreneurs will get a chance to rebuild a better Europe along nationalist lines starting from east to West. Those with the best plans will get bitcoin back loans from the US to do it.