This seems to me a bit like saying we could never have a flat tablet computer because its impossible to have a perfectly flat crt that's thin enough what with the magnetic yoke, the electron beam, shadow mask etc.

"Breakthrough" is used much too often these days. Breakthroughs are breakthroughs because you don't see them coming. It will be laugh-out-loud unexpected when it comes, seem obvious in hindsight, and be one of the few things ever invented that might deserve a patent monopoly to be granted for a small handful of years.