AI will conquer everything and convert most of reality into programmable matter alongside sanctioning everyone inside a gamified system that basically allows you to be a wizard IRL. You will run with giants and mythological creatures, and if you die the nanoswarm will just respawn you somewhere else. If you're a total scumbag you get thrown into a digital hell matrix for what seems like 1000+ years but was actually 10 minutes. The most absurd fantasy you can imagine in your mind will look like trivial nonsense devised by a drooling idiot compared to the things that will actually happen. That's because something a trillion times smarter than you will have orchestrated the entire design, so it's a lot simpler to just say "magic"