Well... if Austria and Hungary agree to devolve the empire due to a crisis that prevents the dual monarchy from remaining united anymore, I think it's actually quite a plausible outcome if no external forces intervene. Slovakia is handed over to Hungary, Galicia-Lodomeria probably a puppet kingdom under a Habsburg, and then the Czechs of Bohemia-Moravia alone probably do not have the numbers to split from Austria, once they are no longer able to ally with the Slovaks. Austria could perhaps retain Croatia as well, or just give it over to Hungary with the exception of Dalmatia so it's not a bother, and pre-1908 Bosnia is not a problem.