Maybe I'm contrarian, cynical, and/or old, but I never fully understood the compulsion to advance an alternative mobile ecosystem in the form of iOS and Android -- at least not with the mission of eradicating OSX, Linux, Windows on laptops.
A tablet with a keyboard is a poor laptop replacement -- slow, limited, and in an awkward form factor.
Most "native apps" are CRUD apps that are better on mobile than web apps mainly just because mobile web browsers need to improve. (Admittedly possible big exception to that: Games.)
So if, after a couple years of experimenting, it turns out many people don't love tablets as laptop replacements, after all? I think -- that's fine. Experiment done. It didn't pan out. Let it go. Let's move the effort back to improving and innovating with "conventional" laptops and OSs, as well as trying things more inherently new like wearables or whatever.
I understand that each generation wants to reinvent all the wheels, but it seems like an unfortunate, wasteful diversion of resources.