So when the market of under-14 and over-25 brings more money, then the crazy people between these and the ever-hungry-teens for graphics, violence, shooter and same-old-games can be ignored by Nintendo. You know what? I wouln't be surprised if the market of 14-25 would never be growing, the effort and money put into the 'ralistic gigatrillionhertz with 600x23789 resolution'-games would never be repayed and both Sony and M$ would turn and try to grab the Wii-kiddie-generation.
It may be okay today to relate on that already dried up market. But with the efforts of ever growing games they must grab more people to pay for them - and always more people. But they aren't more.
But the market isn't as easy as I describe it here or as this guy say it is. There are coregamer of all age as are casual gamers of all age. But only latter are not into the market already. So Nintendo may not cover all of them, since their effort is smaller than the wide developer base of PS2 and X360 combined, but surely the root into these casual gamers and maybe others join and release casual and core games for everyone in the family. Then Wii is enough for all of them, son (core games), daughter (Ponies and Nintendogs), Father and mother (Big Brain Academy, Sims, ...) and all together (Mario, even Zelda, Raving Rabbids,...). So who needs PS3 and X360?
Sure, that's a bit optimistic. But with every developer jumping on the Wii train right now, games may look a bit wider in the future.
And every Nintendo fanboy knows how everyone can be happy playing Nitendo's franchises.
With Lara Croft grabbing Link's Grapling Hook, Lost Planet playing like Metroid Prime with more explosions, everyone's a Nintendo-gamer. They only do not know it.