I never said it’s possible now which is why it’s a 20 year prediction/road map. I seem to recall a very famous developer stating 640k of memory is more than anyone needed, look where we are now.
‘Smartphone technology’ isn’t anywhere near powerful enough to take over the desktop yet but in 20 years the game will have changed significantly. But actually for home use that technology (like an iPad Pro) is good enough for almost everyone outside of gaming, enthusiasts and power users. Hardly anyone falls into the latter and consoles dominate gaming.
Having a pocket sized smartphone by day and docking it into a screen for facebook and youtube by night really isn’t that much of a stretch even now. People have already tried it, they just failed. It’s a bit like how people tried the tablet long before Apple but it wasn’t until the iPad came along until the segment took off.
I honestly think Apple will be the only people to make this future work unless something fundamentally changes. Everyone else is just far too fragmented for now. I don’t think Apple has genuinely created something new for a long time, but what they are good at is executing old ideas extremely well.