I wouldn't be surprised if console revisions/upgrades begin coming out with even more frequency. There was only a 3.5 year gap between the PS4 and PS4 Pro. Only a 2 year gap between the Nintendo Switch and the revision with vastly improved battery life (not as big a deal as PS4 to PS4 Pro, but still a big deal for anyone who uses their switch on the go).
Personally I think I'm going to wait until the PS5 releases and then see if I can find a secondhand PS4 pro at a good price.
