I dont have much faith in the PS5 Pro increasing sales overall much if we dont find out more about whats going on with so many of the 1st party studios. We're all expecting news from Naughty Dog, Bend, etc, that have not only not released an original game on PS5, but they haven't even announced anything. People who bought for Horizon or Spider Man have already bought in.
GTA6 will of course help, though. But announcing the PS5 Pro without reasons why we should buy one (besides slight improvement on already existing games) is not going to move the needle. At most people will trade in their current systems for Pro's, but those sales wont cascade down, because there's still no reason for many people to buy one.
I'm hoping for an announcement from some of the single player devs on games coming when they do the Pro announcement. The dream (and something I think that would be effective) is a Bloodbourne remaster that runs at 60fps/4k only on the Pro. Thats probably a pipe dream though.
Owner of PS4 Pro, Xbox One, Switch, PS Vita, and 3DS