There may not even be half the market for video games in Japan come 5 years. See this:
http://www.bloomberg.com/apps/news?pid=20601101&sid=azo8REkdtnv0
Hell, Greece's sovereign debt was only 113.4% of its GDP before it ran begging to the EU, the IMF, and Germany for a handout in order to keep its economy from reverting back to the stone ages. See:
http://www.economist.com/node/15908288?story_id=15908288
It is easy to think Nintendo will trump all, so long as you have your eyes open only to video games. As a matter of fact, Japan's sovereign debt is closely approaching 200% of its Gross Domestic Product (GDP) if you read the Bloomberg article. Meaning for each $100 borrowed to pay for the elderly, the average Japanese worker will have to produce $200 worth of private goods just to keep money flowing into the Japanese Government's coffers.
If Japan's economy crashes because it cannot get it's sovereign debt under control with a rapidly aging and long living average citizen, then Nintendo will have to get Western oriented entirely because it won't have half the market for it's Japanophiliac games such as Yakuza. Otherwise, Nintendo will go the route of Sega where they catered to the Japanese market for too long and got burned in the end.
