“the future of computing is, and always has been, to make the computers smaller and cheaper.”
I disagree with this assumption. My statement would be:
“the future of computing is to make the computers more affordable and more usable”.
People want as big a screen as they can get, and if interfaces get too small UX suffers. Go into a (successful) electronics retailer. People aren’t buying tiny screens, they’re buying the ones that offer the best balance between large size, image quality and economy.
People love when their smartphone of choice gets a bigger screen because it becomes more usable.
Consumers do want the hardware to be invisible, or as close to invisible as possible, but for many, the optimal experience is still not a handheld one.
And then there are the other arguments about general purpose computing.