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I assume PCIe 4.0 will support the next-generation of Thunderbolt?

I'm not sure what you mean. It should be straightforward to connect a thunderbolt bridge to any version of PCIe.

If you specifically mean "without going over 4 lanes", then that's probably true.

Currently devices have Thunderbolt 3 (up to 40 Gbps), I'm wondering if PCIe 4.0 will increase that. I assume it would be called Thunderbolt 4, and I assume it will be faster.

Personally I would prefer Thunderbolt 3 to get cheaper instead of a new generation that stays expensive. Who needs 80 Gbps Thunderbolt 4 now and why?

External GPUs and Asics. Also, this is a connection that can be shared and the more is probably the better since we all probably have notebooks and they all gonna not have most ports we need.

Increase it how? That's like asking if faster ethernet is going to increase thunderbolt speed. No, it's a totally different way of sending data over wires.

A theoretical Thunderbolt 4 that's twice as fast could easily be fed with a PCIe 3 connection. It could even be fed with a PCIe 2 connection!

Huh, thanks.

I had always thought Thunderbolt was essentially "external PCIe".

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