I believe the Russian Army would have gotten behind Vlasov if the Bolsheviks fell. That was the best case scenario, that Hitler would succeed to the point where Stalin and the Bolsheviks are out of power, and Russia rallies behind a non-Communist to defeat Germany and at least create a new Russian state.
The latter I think more probable. a Russia with much less Europe if any. With the soviets out of the fight, the resources left to the axis would have made Overlord nearly impossible. A new cold war would probably ensue after some time with US/BRIT vs Central Europe Powers. But as with all things one can not really know. (this all depends on the soviets falling early enough that Brittan would still be recovering from 1940 and the USA not in the War at all till 42.