It's really about politics. No wonder people get fired up. Microsoft cleaned up good, but that was just the desktop world. Handhelds are a permanent niche. But they aren't a primary technology.
Wearables are on the way.
For the sake of all our children, I hope the opensource guys get there first. Jakob Nielsen's Alertbox and Tognazzini , two of my most admired UI gurus. Robert Raisch has good insight, rooted in a traditional economic paradigm. That would be the Chinese way, at any rate. You'll find that most of the forward-looking scenarios in the above resources integrate seamlessly with Greenspun's Plan For World Domination.