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There's already 25G BASE-T over CAT6 available. I worked on and taped out a 25G PHY in 2019. Cable reach is 30m instead of 100m though. There's work going on 40G for 10m reach.

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If by "available" you mean that there's a standard. There may be PHY designs that exist but they're not available for purchase, probably because there's no identifiable market. Any potential customer who for some reason wanted to build an AP1000 reactor unit for their datacenter and a second unit for that datacenter's PHYs would need to design their own networking equipment. Which might use 40G but at this point it's questionable — that's the sort of slow equipment you might see in a rack-scale on-premises installation.

The engineering samples are available and if a network equipment manufacturer or a hyperscaler chooses to use it, it can be in production quite fast.

It's a bad idea though. This is the reason it's not adopted in any product.

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