I don't think the former is going to happen, mostly because I think the russian revolution was because at that point communism was seen as a new and untried thing and the elites were very excited about the promise of what could happen for Russia.
Spanish Civil War is what has seemed most likely because the left is importing their supporters, but doesn't match fully.
But with the unrealized tax plan being reinforced, I think that has a possibility to unseat more newly rich people that don't have money squirreled away in trusts and such. People that have a large amount of their money in stock but are below the threshold are likely to be very worried.
This combined with Zuck saying that he was forced to remove content by the government is interesting because not that the republicans will do shit about it, but iirc a lot of these things were initially about "radical openness" and it feels like this goes against that ethos. Add that and the tax stuff to a lot of the people that have a lot of money in stock from meta, google, etc ..