We have had well working 100 Gbit Ethernet for about 8 years now. It's been trickling down in recent years: https://www.servethehome.com/mellanox-connectx-5-vpi-100gbe-... (meanwhile the high end is at 200G/400G now for nics and switches respectively)

See I don't think so, because of the physical limits and energy. I think both are peaking at the same time because while you might be able to invent new physics they are only executable in an environment of energy abundance, and peak energy happened 10 years ago.

Try getting 1Gb/s to work without going crazy first! ;)