It's so rare to see someone speak the voice of reason on future technology matters. People think we'll be able to do anything, when there are physical limits to just how far we can advance current technology.

Even if we invented something new, you have to deal with the size restrictions of atoms. Silicon has an atomic radius of 1.46 Å, gold 1.35 Å, and our current process for manufacturing that's in development is a 2 nm, or 20 Å process, although that number doesn't mean much, since the measurements are closer to 20 nm (metal pitch). There are experiments dating back about a decade where someone created a transistor out of a phosphorus atom. We're a lot closer to the end than we might realize.