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Although the late 17th century is well known for the fact that the Spanish Hapsburgs were dying out. But as the Spanish Hapsburgs were dying out so were the Austrian Hapsburgs. By 1673 the only remaining male of the Austrian Hapsburgs was Emperor Leopold I of Austria. He eventually did get an heir in 1678 when his third wife gave him his 7th child and first surviving son. But what if Leopold'a sons continue to die in infancy as they had with his two previous wives. By the time he dies in ~1705 he only has a few females as his children who survived to adulthood. Would Leopold I like Charles VI try to accomplish a pragmatic sanction and secure the succession of one his daughters to his throne? Or would he potentially seek another alternative heir?
Another what if along these lines, what if his eldest daughter Maria Antonia (who was married to the Elector of Bavaria) had outlived Leopold, would Leopold name her heir or one her sons as heir?