Everyone knows there's a lot of people who play older games. Primarily 8-bit, 16-bit and 32/64-bit. It seems very few people played 6th gen titles/consoles throughout the 7th gen. I played the hell out of the 6th gen during it's stride and revisited it a lot for game series I hadn't played, be it the beginning of a series, mid way or the end.
But will the 7th gen be neglected through the 8th gen. Yes, it's 1 generation older so it's less appealing blah, blah, blah. But would the 7th gens lack of variety compared to the prior gens, most games forcing online integration, DLC and such...There's a bit to come back to but not much.