This isn't really a philosophical discussion but more of a discussion on the benefits of living a life devoid of materialism. — Wittgenstein
I think this is a question of psychology. Why would people subscribe to asceticism? What would make them chose to go without, and just how much are we talking about?
The forces of the post industrial, technology driven world that you believe destroys any individualism are embraced by people because they receive so much from it. Ironically they believe it confirms and highlights their individuality. Which suggests a powerful quest for a sense of individuality they cannot find. To give all that up and to have only what you need, which would be no different than your neighbour, is a real threat to that perception of individuality.
It’s true, as Devan99 said, that we all have to let go of everything in the end, but the “letting go” is not of material things but of who we are. Time, for many, will prepare you for the end, and you will let go of more and more, release the burdens of life, until you’re ready to let go of life itself. But that’s a long lesson about who we are.
The problem about changing our world through renunciation of consumerism is that we cannot be anything else. Asceticism means becoming virtually invisible to others, having nothing but the moment to live in. If we had that in us then we would be different people from who we are.
It’s because this is true that restraints on consumerism have to be applied against our will, or by a reduction in disposable income. But no one will work for less income because of the value they perceive in themselves, their individual worth. So it comes down to the sense of individualism again.
Maybe future generations could be manipulated into this reduction in consumption, but who would they be, could they really live and thrive without a sense of themselves except as a social unit, like an ant or bee? What if the consequences, of let’s call it asceticism, result in unmanageable mental health problems?