Pretty simple question, yet hard for me to answer. I mean, it's hard to predict the future anyway, but who knows what will happen. There would be many variables that would determine if I ever quit playing games... how time consuming my job would be, what if I start a family, what if I find a life, etc.
But ultimately, if Nintendo continues to create great titles, and a decent football game is released every year, I can't forsee a way I would give up gaming. It's probably an addiction I won't be able to shake...