I'm certain Nintendo is doing this already, but if I was Nintendo I would have dozens of small development teams (10 developers or less) producing unconventional game concepts with no real considerations of marketability. Essentially, this would be a form of "pure" videogame research and development. Being that there is no focus on producing anything polished or professional, most of these game concepts could be completed and demonstrated in 6 weeks to 6 months.
After a few years and many iterations most of these concept teams will be cranking out interesting and unique gameplay ideas at a steady pace and Nintendo should be able to farm them for great profit. Being able to constantly redefine gaming would put Nintendo in a unique and very powerful position in the industry.
