After the Revolutions of 1848 failed to unify Germany there was another attempt at unification by Prussia in 1850 at Erfurt. But this ultimately came to nothing as well once Austria had defeated the Italians and Hungarians. But let's say Hungary won its independence (would take an act of god to pull that off, but just go with me on this) and now Austria is too weak to oppose Prussia and a Prussian led Germany is formed in 1850. What happens, how would France, Britain, and Russia respond, and does the rump Austria join Germany in the future?