In an ideal world
-Nords murder thalmor
-Imperials 'surrender' or 'defect', the imperials retreat from Skyrim.
-High rock, being adjacent to two human countries of strong anti-elf persuasion also leave the empire to join the elf genocide war against the thalmor
-Cyrodil preps an army to 'take back the human islands' and then of course uses it to wipe out thalmor.

intentional loss of troops wouldn't have been so awful.