When do you think they will kill off the PS3 and Xbox 360 totally? A side note can anyone imagine a world when the PS3 and xbox 360 is a relic of the past?
Depends on what you mean by that.
If you mean stop production of consoles and games, probably within the next year or two.
If you mean stores like Best Buy and Gamestop will stop carrying them? Several years, probably not before 2020. Especially 360 since backwards compatibility leaves selling 360 games as a viable option. I don't recall between PS2 and Gamecube which Gamestop stopped selling first. I mean, quite frankly, I know if you are stubborn enough you can find stores that carry one or the other, with PS2 being easier to find.