On SPON, there is an interview with Nintendo’s CEO Saturo Iwata (German, English version here) which is mostly about Nintendo’s transition from core to casual.
He’s also asked about the core gamers’ frustration with Nintendo, but he just says they are very important for Nintendo and it takes a long time to develop core games:
You have to understand that it takes some years to make games like “Zelda” or “Mario.” We can’t announce a new one every year [...]
Yes, it certainly seems difficult for such a big company to publish one game a year. 
And why the hell does Babelfish translate “NINTENDO” as “NINT DO”?