I almost agree with you Jaenos(by the way I'm 27). Some of what Nintendo does I don't want them to change. The way they have developed the Mario, Zelda, and Metroid series so far have been great. Don't mess with that formula. What I want them to do though is bring in the 3rd parties more. Games like Skys of Arcadia and Tales of Symphonia where some of the better gaming experiences I've ever had.
By bringing in the 3rd party companies, Nintendo itself doesn't have to grow up but allow the other companies to come in and give that group of players the type of games they want.