A lot has changed over the years.
I've looked over the lists of games released for each year 5, 10, 15, 20, and 25 years ago and selected a couple of memorable games to remind me what things were like the (not a "best of" list).
1995:
2000:
2005:
2010:
2015:
I think that the gameplay of most current gen games (PS4/XBO) could have been implemented with lower graphical fidelity on the previous generation hardware (PS3/360). I don't think the same could be said of previous generations.
I wonder if the included SSD in the next generation will deliver the new gameplay options they are currently promising?