I plan to get the new TCL-6 this summer when it comes out. Maybe that and the new console(s) or my pc will make it apparent.
Better frame rate is always better
You right in that the games you mentioned are fine at 30fps and in regards to those games I would take better graphics and 30 fps over 120 fps everytime but for competitive online games 60fps should be minimum next gen.
It's going to depend on if the visual difference between 30fps vs 60fps is pronounced enough for them to go with 30fps. I think 60fps might become the new baseline for AAA single player games though.
Would be nice to get some informed opinions on if there will be a noticable difference going with 30fps or at least a big enough difference to go with 30fps.