I'd guess never. Twinax maybe, but "Cat8" would probably be more expensive than fiber above few metres already. Fiber is cheap, it's fancy electronics, lasers a

I'd guess never. Twinax maybe, but "Cat8" would probably be more expensive than fiber above few metres already. Fiber is cheap, it's fancy electronics, lasers and photodiodes that make the thing expensive, but once you're there per metre price is cheap.