Yea that's the good thing about good games coming out every few months, once you're done with one, you can move on to the other.
But nowadays, there's so many ways to play if a game is half decent it shold never get old. For example, I see myself playing this 1 player as well as with friends, PLUS I can play online.. it's never the same experience.
And as for revisiting old games, I've got my old NES hooked up as we speak. Excitebike is just as good as I remember it being.