The thing with the prosthetics is that I feel like there's hundreds, if not thousands of companies and individuals working on them, but there doesn't seem to be any convergence, or more importantly, mass production - meaning that prosthetics remain expensive and made-to-measure. This is a thing with a lot of things that look very high-tech or science fiction.

That said, video calling was the realm of exclusive, high-tech / demos for a long time, then without really being aware of, it's been available in everyone's pocket for a long time now. It went from near-sci-fi to mainstream in the blink of an eye.