I don't think they have any revolutionary potential. There are a large number of far-right people willing to do violence, but how many of them are willing to risk losing their lives or their businesses or their treats? They're only willing to drive their trucks through crowds because they know there's a good chance they'll get away with it. They're also incapable of organizing with their peers, they'll only attend a meeting if they get to threaten the school board or whatever. They view discipline as an unjust imposition on their freedom.

They can do terrorism but can't engage in sustained conflict, they're basically like Israel settles but less capable and less unified.

But ultimately the US is declining into some kind of neo-fascism anyway. It doesn't rely on their revolutionary potential, it's just the logic of our ruling institutions.