I think it will come out sooner than you may think because Sony has no real reason to delay it. The RAM situation? Sony anticipated it and bought a whole bunch of them before the price increase. Though, to be honest, I wouldn't want it to come out yet, mostly because most players have only just started using the PS5 as opposed to the PS4 earlier this year. I would love for them to continue working on the PS5 to reach its peak before thinking of making a new, but expensive and likely buggy, gaming system.
I think Sony will probably release the PS6 around late 2027 or 2028. That would follow their usual 7-to-8-year console cycle and give developers plenty of time to get the most out of the PS5 first.