Hell, Samsung is delivering Linux to the masses in the form of Wayland + PulseAudio under the brand name "Tizen". Unlike desktop land, Tizen has been all-in on Wayland since 2013 and it's been doing fine.
Likewise with ChromeOS.
They are Pyrrhic victories.
As for Tizen, interesting that Samsung hasn't yet completely lost interest on it.
Except neither will support even a fraction of the originals' capabilities, at much worse performance and millions of incompatibilities at every corner.
The OS is a mix of Java, Kotlin, JavaScript, NDK APIs and the standard ISO C and ISO C++ libraries.
This would be better phrased If Google could replace Linux kernel with something else noone would notice,
Google have spent a decade trying to replace the Linux with something else (Fuschia), and don't seem to have gotten anywhere
Also don't forget Fuchsia has been mostly a way to keep valuable engineers at Google as retention project.
They haven't been trying to replace anything as such, and Linux kernel on Android even has userspace drivers with stable ABI for Java and C++, Rust on the kernel, all features upstream will never get.
Or on Rust's case, Google didn't bother with the drama, they decided to include it, and that was it.