Okay, I have done a little more research into postmodernism. While it may be the dominant school of thought after modernism, I'm not convinced it's dominant right now. It seems at the very least on the wane, giving way to (for lack of a better term) a post-postmodernism.
The presentation of postmodernism seems to largely be as a sort degradation away from social order and the "Great Narratives". This is a presentation I am not convinced is accurate. For instance, the Green Revolution seems a great narrative to me, but it seems to be a postmodern event. Nor am I convinced we have moved away from social order as much as we have moved away from hierarchical social order, which is to say the structure of social may have changed, but there is no less order than existed before.
I keep seeing individualism as presented as a negative thing. As a libertarian, I have to question this. Individualism seems to be considered individualist anarchism, as if somehow people are exiting or rebelling against society, and yet this is clearly not the world I see around me. If anything, people are finding more ways to connect to one another, not less. Subcultures are growing in size and number, and even those subcultures who might be considered countercultures by the more traditional, are only marginally so. There is even plenty of overlap from one subculture to another. Goths can be and often are also computer geeks. Members of the SCA can be sci-fi fans. A philosophy academic wrote one of the longest and most famous BDSM novel series ever published. And all that doesn't even begin to account for the internet.
You said, "Postmodernism offers a life of alienation, destructive individualism, selfishness, and crass consumerism pushing us further towards the collapse of bourgeoisie societies." I don't agree. I believe I am beginning to grasp why some people think so, but what I find is not a society of people living alienated lives, rejecting society and engaging in self-destructive behavior. Yes, some people have some of these problems, but that is not unique to postmodern times. There have always been such people. What I find in society overall is an increase in individual expression that does far more to strengthen society than to weaken it. What is weakening us as a society are the actions of those who seek to cling to an authoritarian, hierarchical, top-down, modernist model of societal control.
One of the more common complaints about postmodernism is people being cynical. The most cynicism I found in looking into postmodernism seemed to come from the critics of postmodernism. They criticized individualism, capitalism, deconstruction (in various forms), entertainment, and on and on. Where I see people more free to define themselves and pursue happiness, the critics of postmodernism seem to see fragmentation and decay. Which seems to bring me back to a point I made before. The criticism of postmodernism sounds a lot like the good old days spiel. And this notion you have that postmodernism is some how a road to "the collapse of bourgeoisie societies" seems a close cousin to the cry of the crotchety old man who insists the kids of today are ruining society.
I know you think the end of bourgeoisie societies will lead to some sort of Marxist/communist society rising up, and you think that is a good thing. But I don't agree that we are heading for a societal collapse. Societal change, yes. But then, society is always changing. I think the folks who want to try to direct the change by imposing socialist ideas or by trying to tightly control immigration or this or that scheme to mold society into something better are never going to achieve the betterment they say they want. The closest society will get to communism is the break down of top-down hierarchies as solutions to large-scale problems. The change will be gradual, and society will not collapse. It will simply keep evolving set by step. Capitalism will not vanish, it will simply be modified by the evolving society to meet society's needs.
(And for that matter, socialism/communism/Marxism would not, imo, result in a classless society. There would always be some sort of class, even it was ruling and non-ruling, or the people and the "enemies of the people". Or academic and worker. There would always be a justification for stratification, because there would never be the consensus of thought necessary for there to be none.)
And in any case, I think we are moving to something past postmodernism, due in large part to the expansion of the internet and computer technologies, and in 10-20 years, someone will be explaining that whatever they end up calling post-postmodernism will be "pushing us further towards the collapse of bourgeoisie societies." Though I doubt we will be any closer then than we are now.