Some leftist form of government was guaranteed in Russia. If it wasn’t Bolshevik branded Communism, it could have been some flavor of socialism. As best I recall of all the agitating entities in Russia prior to 1917, *none* of the serious ones were demanding democracy. Remember that prior to Lenin’s October Revolution, there had been a February Revolution *without* Lenin and the government that resulted was heavily manned by socialists.
I’m inclined to agree with you about some kind of leftist government, though I do know that the monarchists like Denikin etc. were also strong AND they had the army on their side, so a cabal like post-Imperial China