I doubt they have the guts to pull it off.
I don’t mean to be offensive, but you’re naive. Imposing Marxism on the world is a fight to the death. This is the Left’s best chance to take America down. Dedicated Marxists have no problem at all with using violence to achieve their end.
This isn’t hypothetical. History shows us Marxism has always imposed itself via force. There is not one instance where it hasn’t.