I think you misread my original comment. I was saying that the Blackmagic eGPU in an upgradeable form factor would mean that you get a 200-300 $ (or something

I think you misread my original comment. I was saying that the Blackmagic eGPU in an upgradeable form factor would mean that you get a 200-300 $ (or something like that) GPU enclosure with some electronics in it (Thunderbolt hub, power supply etc.). Then you stick a current GPU into it. This would make sense because GPU replacement cycles are much shorter than the interconnect upgrade cycle. That's why I said that most applications are still fine today with the over ten year old PCIe 2.0. So just to reiterate: PCIe bus speed is simply not a limiting factor for the overwhelming majority of GPU applications.