The upcoming revolution in America would certainly play a role as well. If it happens in America first, it would significantly add fuel to the simmering fire in the Russian Empire, being a beacon for world revolution and all that. Like you said, the Russian Empire was in it's death throes even before WW1, with the the 1905 revolution and it's aftermath to prove that. It was only a matter of time before all that social unrest explodes into civil war.
On the other hand, it would certainly be interesting to see how the USSR would develop when they have someone they could confidently call an ally during it's socialist construction though. Having a big industrially advanced nation backing you up all the way would do wonders for the Bolshevik siege mentality, which forced them to take... let's say stringent measures OTL in order to survive, being isolated and surrounded on all sides by hostile powers and all. But that's supposing the USSR would even exist ITL, so we'll see.