There is some evidence Stalin was willing to agree to a Brest-Litovsk style of peace.
Let's say it was sincere and Hitler or a saner German leadership after he has an accident, agree and seek on top of that to not go to war with the US by all means.
What effect would this have in the Western Front and war overall?
The biggest issue I see here, is that given how a L-B peace is for all intents and purposes a surrender, Germany would had been able to sell to the world that she indeed defeated the mighty USSR, another Great Power, within months at minimum cost.
This would had surely been a huge blow to the British morale, Britain would once again be left alone fighting Germany, dependant entirely on rescue by the isolationist US, with war at no end in sight, lots of German troops and resources free for the Western front, the German aura of invincibility super reinforced, plus whatever resources they get from L-B making Germany even stronger than they already are (or at least percieved to be)
Do you think this could be enough to bring Britain to the negotiating table? What would the effects of these events be?