Nintendo's home consoles are still performing well enough that I highly doubt that Nintendo would license their franchises like Super Mario, The Legend of Zelda, Donkey Kong, and Metroid to other companies' games rather than keeping them as games exclusive to Nintendo's own consoles.
Such a practice doesn't really seem to begin until a company is in more dire straights and abandons building their own exclusive home consoles. E.g. Sega didn't segue into such licensing until they abandoned making their own home consoles and started making games for other systems. If Sega were still making their own consoles, I very much suspect that the likes of Sonic The Hedgehog would still be exclusive to Sega systems and moreover we wouldn't have Sonic and Mario co-starring within the same game.
(As a non-video game example, Marvel Comics didn't start selling the motion picture rights to their various franchises to a myriad of different film studios until they went bankrupt in the nineties--a move that Marvel now regrets now that they have their own film studio. Then again, the comic book industry also has a strong precedent for different, normally competing companies sharing their characters in special cross-overs in which the Justice League meets The Avengers, Batman meets Spawn and Judge Dredd, etc.)
Granted, there are a few anomalous exceptions like Nintendo lending the Mario and Zelda licenses to the Phillips CD-I. That's a special case due to a special deal between Nintendo and Phillips for that console (just as Sony and Marvel Studios just made a special deal to share Spider-Man)--and ended up as a totally disaster for all involved, thereby likely making Nintendo hesitant to experiment with such licensing in the near future (just as the spectre of the failed Virtual Boy most likely makes Nintendo hesitant to dip their toes in the virtual reality waters any time soon).
However, all of that being said, I can envision a special case in which Nintendo may indeed start marking games for something other than their own systems: Nintendo making rather simple time wasting games featuring their licensed characters for smart phones (a modern Dr. Mario on your iPhone, for example). Such games are one of the hottest trends in the current video game market (some even tote it as the future of video games), and I don't see why Nintendo wouldn't want to enter that market for themselves (without going to the incredibly risky and ill advised extreme of making their own smart phone device).