I don't know, I'm trying to be a bit realistic about it when it comes to another new OS that can run on real hardware and is reliable enough as a daily driver. Might take more than two decades for it to be as usable as macOS.

By then we would be just still running Windows / macOS on our ARM desktops / laptops, Fuchsia on our phones, tablets and chromebooks, Linux still stuck on the server and everything else stuck in a VM or simply abandoned.

Nah, most devs with be using their tablet playgrounds, as thin clients to Cloud OSes.