Relative abundance is a concept worth considering. How much food is thrown away vs produced? Housing laying empty per homeless capita? Space needed to power the world with solar power? Trillions of dollars in valuable minerals from one asteroid?

One thing is for sure, the sustain each human's basic survival needs, we have already surpassed the requirements. To sustain a hedonistic treadmill x8 billion, sure, might get dicey. But we are world builders, and I believe the natural path forward includes simulations. Maybe in the short term, maybe in the virtual reality long term.

dyson spheres etc are already known solutions to high energy needs.

Of course there are limits in a finite universe. However there is ample energy and matter on earth to allow for all of us to enjoy a very luxurious lifestyle so long as we don't let a handful of selfish people try to hoard it all.

The only real possible shortage is land. Even so, in a post scarcity world a lot more of the earth's surface and oceans will be habitable because proximity to fresh water, infrastructure and jobs won't matter anymore.

there are near infinite planets out there for the ASI to strip mine, and beyond that, at some point reproductions probably going to fizzle out for the most part. FDVR, immortality, and general lack of incentive will probably lead to population growth slowing down to a crawl. Amish people will probably try to keep the trend alive. Their probably gonna end up in a reserve or something.

True, there will always be some level of control of one group over another. Classes will always exist