So, basically most of the threads I could find connected to this period were either "Prussia and Co. dismembers Austria" or, sometimes "Austria & Co. dismember Prussia". I wanted to ask for your opinion with a different idea. What if HRE Charles VI lived a little longer? Let's give him another five or six years. What happens next?
1) I suppose Austria won't be very effected but at least they'll recover somewhat from the Turkish war of 1737-1739. However, Maria Theresa will still be challenged. Any other butterflies?
2) Frederick II of Prussia is definitely just waiting for an opportunity and will probably use the same excuse to invade Silesia. Any changes for Prussia in the meantime? And also, the involvement of Bavaria and Saxony depends on Frederick's success which will probably happen similar to OTL. However, OTL Charles VII died seriously ill in 1745. I believe he could live a littler longer not having to run across half of Germany and dying in poverty so he's there to make an attempt on the Imperial title.
3) What about Spain and the situation in Italy? IOTL Elisabeth Farnese did everything to get an Italian principality for her son but if Philip V kicks the bucket as in OTL (and he most definitely will) Fernando (or better said, Barbara of Portugal) will completely reverse that policy. Even in OTL they kept on with the war halfheartedly because they were already stuck with it and because Fernando feared his brother might make an attempt for the throne if he stays in Spain. Without Spanish involvement in Italy how will things change? Does Sardinia make different alliances?
4) The "War of the Jenkins' Ear" is ongoing at the time. France never planned to get really involved but both Spain and GB have additional resources to send to the Caribbean if they're not busy in the Mediterranean like they actually were. Any changes there?
5)What happens when Fleury dies? By 1743 he was very old and will not live any longer so a number of changes for the French policy are possible. There is no illness of Louis XV at Metz and maybe no Madame Pompadour (although her ambition alone is proof enough she can get into the King's bedroom). Will France remain de facto neutral in the British-Spanish war or will Louis be convinced to take a different role?
6) I'm not much of an expert at British politics but who will be in charge in a different War of the Austrian Succession when it eventually happens? Carteret, Newcastle? Any changes there?
7) The war also had some influence on the Baltic. Will the Hats' war happen without a wider European conflict in the meantime? Could Elisabeth's coup against Anna be butterflied away? Russia could potentially turn out to be an important player in such a war.