#1 is already happening, though the US will bring out the nukes (and probably even bioweapons, etc) before they ever stop being a bunch of genocidal rampaging barbarians. And I expect they will get destroyed by their victims' retaliation and hope it will be as decisive a retaliation as necessary, no matter what it takes.

#2 will come in time as well, I think. Hell, I think that if things escalate far enough, even India and perhaps the rest of BRICS will be forced to act, militarily- a basic understanding of US/western nuclear exchange planning, as well as the sheer inhumanity of the western imperialist system, will show just how deranged the west is and how intolerable and destructive it will be (should it be able to maintain its fascistic forces from within- the hope being of course that the empire could implode from within and that those involved in the processes of escalating to nuclear war and worse have the sense to revolt should push come to shove).

#3 is lowkey happening, IMO. I suppose if nothing else they seem to be imitating what works in some degree (the Chinese model of development and even the Soviet legacy which is not yet fully dead). Without the principles of proletarian rule I expect it will regress in time, but it's doing something halfway right (and in foreign policy it's doing a hell of a lot right), I suppose.

#4 is basically happening everyday, isn't it?

And #5... isn't going to be an accident, if it happens. The same country that has bombed its own civilians, which has used bioweapons and chemical weapons on its unaware civilians, which uses militarized police against its civilians, will naturally bomb them again, and nukes aren't out of the question. And honestly if the US somehow doesn't bring MAD upon itself before it gets to such a point, it'll probably strike those preventing it from doing so- maybe with nukes, who's to say?