In a document outlining Russian plans regarding a coming war the goals had been defined as following:
1. Weakening Prussia to such a degree that it would not be able to interfere with the Russian “interests” in the PLC.
2. Austria should get Silesia.
3. Poland should get “King’s Prussia” (which meant Ducal Prussia).
4. As a compensation for #3 Russia is getting a freedom of operations on Polish territory and:
4.1. Courland
4.2. Vaguely defined territory on the Southern end of the PLC which would allow access to the Black Sea (to which the PLC did not have access so perhaps some “follow up” with the Ottomans had been planned).
Of course, none of the above happened as a byproduct of the 7YW but what if the plan worked out? Probability was admittedly low but well above zero (more energetic Austrian and Russian commanders, Austrians managing to handle supplies issue for themselves and their allies, Elizabeth dying few years later).
To sum up: Prussia is defeated, Austria regained Silesia, PLC got the Ducal Prussia, Russia got Courland and a chunk of the Southern Right Bank Ukraine. How European affairs are proceeding from that point?