As likely as the rapture. Or in materialist terms: as likely as the bourgeoisie giving up their private property and handing the reigns of power to the proletarian vanguard without violence.
Edit: I like Dr. Justin Sledge's idea that the revolution happening by itself (inevitable due to the contradictions of capitalism) as apocalyptic literature, as a criticism.
Out comes "authoritarians" again, like that word means anything.