Of course, eventually Nintendo will have to stop the console production and things will come to an end then. But by that point, videogames will have become so oversaturated; so same-y and so uninteresting that the very market itself would have to collapse before they leave.
As others have said, Nintendo have confirmed that they have no interest in a 3rd party lifestyle, so don't expect there games to be on anything other than their systems. The real sadness will come when Miyamoto retires; because that will be the end of "classic" Nintendo, as it were.
But we'll always have their 30 or so years of games, many of which rival today's blockbusters, anyway.







