You won't find me making predictions very often, but here it is. My first sales prediction thread.
I just got a bad vibe coming from these two. Both of these consoles I think look quite unappealing for the general consumer and are waaay too big. The Xbox One had these issues to an extent, but not this bad - and it already was mostly a failure outside the US. Furthermore, it feels like more and more games are coming to PC, with a lot of PS4 exclusives getting ported over to the PC at some point, and Xbox basically giving up on the idea of exclusivity as a whole. Sure, Sony will ensure their games take a while before the ports happen, but I think many people are gonna decide to skip consoles if they know they can get their games on PC later - especially since most people don't buy consoles early to begin with.
Consoles are getting to a point now where they're not even trying to hide the fact that they're just glorified PCs anymore. Their designs look way too much like what you'd find on gaming PC stores, almost like they're trying to appeal to that market more than console gamers, and even the size of the things isn't too much smaller than some desktops out there. But of course, the PC audience isn't exactly there for the taking.
Then there's the issue of pricing. We don't really have official numbers on these, but I think most people expect these consoles to ship at $500 at launch, which is... pretty steep. I think consoles need to have at least some casual appeal in order to be a success, but between the design, size, price, and lack of exclusivity, I don't see where the general audience interest will pick up. Besides, I get the feeling that nowadays most people don't care about crazy graphics anyway.
If I gotta put it in numbers, let's see...
35 million lifetime Xbox Series X
80 million lifetime PS5
Now I just gotta get ready for some crow.