Thanks for the many replies everyone, especially those that gave their best sales guesses! :)
I agree that the restriction against games only for the "Pro" consoles from last-gen should be removed. At least for digital-only games, where it can be made very clear to the person that the game isn't compatible (on a base PS4 or Xbox One, it could actually pop up a warning if you tried to buy it on anything other than a "Pro" console).
As for it being worth it or not worth it, some of these "Pro" consoles are still in use with people who haven't been able to find a next-gen system yet. Others will presumably be passed on to others, so they have some life left IMO.
As for the argument that a mid-gen refresh should happen at least 4 years in, rather than 3, I agree. Microsoft did that with the One X and I think it made it a more interesting mid-gen console. I also think it will take longer before the current-gen consoles fall far enough behind PCs that a mid-gen refresh is necessary, since this gen the consoles aren't starting quite as far back as PCs as last-gen with its souped-up mobile CPUs (ugh).
As for it being technically non-feasible because even the Series S is more powerful than any of the last-gen "Pro" consoles, I understand that the Series S is more powerful. And worse, yet, DIFFERENT (compared to the One X and PS4 Pro, the Series S has a better CPU but not necessarily a better GPU). But, perhaps at a somewhat lower level of fidelity, it could be done reasonably well. Much closer to the Series S version than a base model from last gen could do at least.
To those who predict it won't happen, you're probably right. But it's nonetheless an interesting thought experiment, and something that would be cool to see happen. :)
