I think the demand for PCI express 4.0 is going to be a lot higher than you realize.

The new PS5 is going to have SSD speeds of over 5000 mb/s, and is coming out soon.

PC gamers are going to be jealous until they are able to have speeds like that. After all, they are supposed to be the "PC Master Race". But the only SSD devices on the PC that can come close to the PS5's SSD speed are PCI express 4.0 devices.