The relevancy of consoles is not that dependent on power though before 6-7 years of age.

I could see anywhere from 16-32, but I doubt it'll be any higher than that. Ram has kinda slowed down in development (as have CPU's), at least from what I've seen these past few years.

It's dependent on memory though. The 5GB available for games is a bottleneck on ps4, just as the 256 mb graphics ram last gen severely crippled some games on ps3. More memory also helps loading times as more things can be kept in memory without having to be reloaded from disk. As games get bigger and bigger, load times are going to be a challenge. Game sizes outpace affordable SSD storage for now.

I think I'm not mistaken in assuming that most PCs built for gaming have only 16GB in them (I have been running on around 24GB since 2011 or more).

This is kind of tricky, as the xbox one X has 12 (and it seems to make a good difference for textures (unless it's really the bandwidth that helps?)

so 24 or 32 would still be possible, but given how much it costs I'd assume 16-24 is more realistic (I'd rather take a faster GPU/CPU than more memory that will be used less often... notice that I would prefer them to offer support for 120+fps in games as opposed to emphasize 4K gaming, but given a fixed power envelope it's really up to the developers to make the call on this one.

So Sony had better LISTEN TO ME over Cerny!

That guy has amazing shopping skills... I don't even think they carry 32GB laptops in any store near me, it's hard to find one that has more than 8GB.

Where you from? My laptop is capable of 32gb RAM, of course it only came with 8GB. The upgrade wouldn't be too expensive, and I managed to get it for $900.

128gb was a joke, right? lol

Even half of that would likely go to waste before the rest of the hardware bottlenecked unless this is a very pricey console.

I am not sure. Playstation is such a big brand within gaming, having the best selling consoles of all time. At least for a span of 6-7, developers won't change whether or not they release a game on a console based on memory. Rather, the majority of the industry will focus on maintaining a much lower ceiling for possible technological advances in games to accomadate consoles. You mention the PS3 for example, which had a 7 year lifespan, and the Xbox 360 in that same gen had an 8 year lifespan, which are above average. 

I do hope the ram count is 24GB, since I see the effect of limited RAM on PS4 quite often. 

I think it'll be 16 GB of GDDR6, the vast majority of it for gaming, with 2 GB of DDR4 to help out with the OS. This is similar to how they built the Pro, only with 8 GB GDDR5 and 1 GB DDR3, so I see them sticking with that for the PS5.

My laptop is 4 years old and has 16GB of ram... From a local best buy, it was CAD 800 at the time though. It has a GT 740M, useless nowadays and overheats quite easily. But it has a lot of memory! 7 GB in use for just browsing the internet lol.