Never forget, the bourgeoisie rose under feudalism because they could support armies of competing princes materially!
And if you have military threats between nations, you will reconstruct the same thing. War requires accumulation and hierarchy, or at least did in the 20th cen.
Both from the material base - if the richest countries continue to have the means of production held by the bourgeois, their class interest can subsume profit long enough to strangle #socialism - and from the cultural/superstructure
A national based revolution will only reinforce nationalism, which means that the society will have to form hierarchy to enable defense. And that means you get either the bourgeoisie, or the nomenklatura who will revive the bourgeois
Class is real, nations are not