i think mir is here to stay. Ubuntu is creating a universal os that can run on anything and mir is a part of it.
AMD etc will get on board, I am pretty sure because ubuntu looks really good on phones and tablets. Better than
anything else out there.
What bothers me is the new click packages and the way they are starting to keep their development private.
If you extend these actions outward they seem to be heading for a private linux all their own.
Consider that they are now headed by a former Microsoft biggie steeped in EULA''s, patents, DRM's and
the rest of that garbage and I think they have something planned, ala Microsoft's style, up their sleeves.
They could easily crush all the distros built on Ubuntu if they want to.
As for MIR I hope it can be removed and replaced easily by Mint and the other distros.
The linux of the next few years will be radically different from what we are used to no matter what.
Oh, and don't forget Microsoft has a big investment in Ubuntu!!