Just because a game is 'next-gen-only' doesn't somehow necessarily mean it was built in a way that negates it ever being feasible for last-gen.
I mean, I look at MGSV and think "no way this shit was possible last-gen", because tech-wise it's such a huge leap from MGS4, but we know that's because of the massive investment put into Fox Engine that makes the 60fps open-world awesomeness possible, and not because of 'b-b-b-b-because PS4/XB1 is s-s-s-s-so awesome!"
I mean, look at Blop3. For what is 'next-gen only', it didn't look remarkably stunning or visually mindblowing. Great, sure, but it didn't elicit Battlefront-tier of "this is complete bullshit, I don't believe it's real-time 60fps gameplay!"
I feel like tech is really more important than console horsepower in this gen. The ability for the foundation of the game to do all the crazy stuff like asset streaming, AI, lighting, etc while still delivering 1080p locked 30/60fps.