PS5 Pro?
I am not sure we need it personally. We still are only this year seeing a switch to current-gen only games with developers dropping the last-gen systems. That is a good thing because it means they have fewer consoles to test and support for their games, meaning they can focus on optimising better for the current platforms. The last thing I want to see is them again having to support another platform which could mean an inferior experience on the base hardware, say, if they decide to just use the Pro hardware to brute force a stable framerate or higher resolution instead of optimising for the lower-spec hardware first. Also, it splits the user base and while first-party games will take advantage of the more powerful hardware, the smaller number of users means that third-parties won't necessarily.
PS4 Pro came at a time when 4K TVs were becoming mainstream and that console ended up being more of a 1440p console rather than a 4K one. The Xbox One X was a much better platform for 4K gaming but it came too late and was poorly supported. Both consoles were held back by weak CPUs.
What could PS5 Pro possibly offer other than support for 8K, which no-one really cares about and which Sony still don't support on PS5 despite it being advertised very clearly on every box the console ships in? The PS5 already has a capable CPU and GPU. The Pro could ship with a larger SSD and faster GPU but at what cost? PS5 has already increased in price in many territories so the Pro model would almost certainly not be cheap and if is expensive then it means fewer sales (much like the low sales of the PS VR2 headset).
As for Switch 2... while I think it will launch sometime next year and will likely only be a small improvement on the current Switch because high-end hardware is no Nintendo's focus any more. And I think it'll launch before PS5 Pro because I sincerely hope we do not get a PS5 Pro. My PS5 feels like it has barely been used for current-gen games.