The better question is “would Hitler have come to power” if the Soviet Union did not exist?
His main enemy in the German street were Communists. Fighting them was his legitimacy.
If Kerensky had prevailed, would any of this have happened?
Good point, the German industrialists were scared of the Bolsheviks, and while they didn’t particularly like Hitler, they saw him as their best chance to oppose them.
Hitler had a lot of opposition within the Nazi party ranks, because many in the SA, were pretty much Communists themselves, who wanted complete government control of all German industry; that was one of the reasons for the Night of the Long Knives.
If I recall my Russian history correctly, an earlier World War was largely responsible for Kerensky's failure.
He insisted that Russia stay in the very unpopular First World War, which meant more Russians dead or grievously wounded, and which meant further destruction of Russia's already terrible economy.
One other point, from memory...
As I recall, Kerensky, at heart, was a decent man and a Utopian socialist.
Lenin, at heart, was a radical revolutionary, and a ruthless murderer.
Not exactly a fair fight, for Russia, or for world history.