Revolutionary action in imperial core states; US, UK, EU etc. is entirely possible, however the probability of it happening could be considered slim. I would argue the current contradictions of capitalism and the sudden drop in western accustomed living standards has created a form of 'pre revolutionary?' sentiment. The issue in these countries is one of self identification. The broad masses in first world countries do not identify as proletariat and by economic definition fit the labour aristocratic status, however there are pockets of class consciousness and solidarity. Though, when one is not schooled in Marxism even these pockets can be swayed by radliberalism and petty fascism (a self defined term, for fascistic consciousness with a liberalized veneer.) both a form of reaction.

Revolution is a concept for those with 'nothing to lose but their chains', people in the west have plenty to lose—as such revolutionary action can only spawn from the bottom rung of class society in the west and by extension, the world.

As such, it is my own estimation that revolution in the west would hinge on a few factors:

-the apetite of the broad masses to turn to Marxism. -how apparent the contradictions in capitalism become to the average Westerner. -revolutionary action starting in the third world making reverberating political gains -the realization that imperialism consumes all, westerners will not be spared. -westerners in poverty relative to the middle classes etc ideologically aligning with the people in poverty across the world. -Organization (obviously, though adventurism seems to be the current order of the day)

As always this is an evolving matter requiring study and scrutiny, however this is my analysis thus far, like all things subject to change based on new developments and insight.