This is why I don't post here often:
https://www.resetera.com/threads/ru...aiming-higher-than-10-7-teraflops-gpu.107952/
Anyway, I don't know for sure what next-gen specs will look like. I have no idea how many teraflops there'll be. A dev recently told me that a lot of people within studios are just making assumptions based on limited information, and that one of the assumptions is that everything's going to be twice as powerful.
The bigger question IMO is how many platforms people are going to have to ship on. Last generation's cross-platform games had to ship on five -- PS3, 360, PS4, XB1, PC -- which made people miserable and led to a lot of sacrifices. Now that number's getting even bigger thanks to mid-gen hardware refreshes and cloud platforms. That's what I think is ultimately going to hamper AAA games, not hardware restrictions.