Just thought that I should mention that, in this scenario, Britain will be just waiting, poised to restart the war against Germany as soon as a reasonable chance of success appears. It is not in Britain's interest to see Germany dominate the continent, nor the Soviets doing the same. Plans to seize Crete, Sicily, Rhodes, Sardinia and Corsica will be put into effect at the earliest possible opportunity. Forces from the (British) Home Islands, Commonwealth and Empire will be put together in southern England, awaiting the possibility of a landing in France.
It really isn't possible to have a German-Soviet one-on-on indefinitely. An interesting scenario nevertheless.
Voted 'maybe' because the situation of the USSR could become so bad ITTL that a political collapse occurs, especially if Moscow, Leningrad and Stalingrad were all lost and held by Germany. Militarily, the Soviets can simply continue to withdraw until the Germans outpace their supply lines - politically, they are more fragile.