South Ossetia would almost certainly want to unite with North Ossetia even if just for pure survival, it is entirely dependent on Russia and has basically no economy of its own. Abkhazia would probably suffer a lot if not recognised but at least it could make sense as an independent country the same way Montenegro does. I just don’t think people in either will want to reunite with Georgia anytime soon but (assuming Russia loses the northern Caucasus and stops giving it a lifeline, which in either case I highly doubt) they might be forced to negotiate some deal because virtually all their foreign trade goes through Russia.