This will always be hamstrung by the lack of stable APIs - the issue which Google is so fed up with, they are in a process of writing their own microkernel, zir

This will always be hamstrung by the lack of stable APIs - the issue which Google is so fed up with, they are in a process of writing their own microkernel, zircon. You might have noticed that Android phones are supported at most for three years - that's because HW vendors refuse to maintain their drivers compatibility with lots of different kernel versions - it's expensive and takes a lot of work. Once you have stable kernel APIs - you can write a driver once and forget about it for eternity.