Right. This is what I think Fuchsia and Zircon probably are headed for long term but people really felt the compulsive contrarian need to stake out the experiment/retention project angle since so many saw the obvious but were hyperbolic about the timescale.
Not sure if it's ever feasible to replace Android (it's going to take at least a decade even assuming that Google becomes serious) but I think ChromeOS seems a reasonable target. It's not going to be as spectacular as Android but a decently successful migration if done properly. At that moment, I guess people can make more serious investments into Fuchsia.
https://android-review.googlesource.com/q/fuchsia
What is more likely to happen is to replace Linux with the Fuchsia infrastructure.