Nah I hope they move on after 3. Three games in a series is always good enough and I don't really care for more after that. It's one of the reasons I left MS behind because they just keep pumping out the same titles and it gets old. You stop caring about the characters and world as the story gets more and more ridiculous.

Plus a lot of these studios have other ideas and projects they become passionate about and want to work on. Last thing Sony needs is to end up pissing off one of the devs by forcing them to continue to pump out HZD 4,5,6,7. Thankfully Sony has always seemed to give their devs a certain amount of creative freedom.

I'm not talking about a series of 10 games following the same story, I'm talking about titles with different stories, timelines and characters. Like Zelda and Final Fantasy.

Also different devs can tackle it later down the road. 

Probably will rum sub 1080p on the base PS4 900p with dynamic resolution to 720p and run in a much higher resolution on PS5 with better AA, shadows and ray tracing. It might not look as good as Demon Souls, but it will still look great. Also we don't know if they will release at the same time. Witcher 3 was ported to Switch in a few months. So it could still be that the PS5 version is the main focus and they will port it to PS4.

I guess that would be more ok but even then I have to imagine at some point the studio will want to do something else eventually. So they'll need to maybe pass the IP around, maybe hire small new studios to continue it, etc.