If Nintendo was just hell-bent on opening up new audiences, you wouldn't see titles like Mario Galaxy, Metroid, Super Paper Mario, Mario Kart, Smash Bros and Zelda: Phantom Hourglass all coming within six months.
and people tend to think that, just because they spend a little bit more time on Wii Fit at the E3 press conference, that it's all over for us core gamers.
I honestly get a bit concerned, because I've heard a bit of that feedback coming from hardcore gamers saying 'Nintendo don't care about us anymore', and I'm sort of a little more privy to the games currently in development and what we're bringing out and why we're bringing them out. The next batch of games coming out are classical Nintendo games that the hardcore gamers will just love to play.
Basically, they haven't stopped making their core games.
As IGN said, I think the REAL complaint is the lack on new IP's. However, Miyamoto spoke of a new IP developed by Nintendo EAD, not published(Disaster Day of Crisis), next year.
GC era, we saw Pikmin the first year, and Animal Crossing (though this was originally set to be their new IP for the N64) the next.
Wii era, we have seen Wii Sports/Wii Play first year and Wii Fit/Wii Music + New core IP next year.
The difference here is that Nintendo EAD brought/will bring out 5 new IP's, but 4 are more casual based, rather than core based. Of course, with the idea of expanding the market, they had to make the compelling software to bring new players in, while still bringing in Mario Galaxy, Metroid, Super Paper Mario, Mario Kart, Smash Bros and Zelda: Phantom Hourglass all coming within six months for the core gamers.
As it stands now, they are doing much better, publishing wise, than the GC era.
2001
Luigi's Mansion
Pikmin
Super Smash Bros. Melee
Wave Race: Blue Storm
2002
Animal Crossing
Disney's Magical Mirror Starring Mickey Mouse
Doshin the Giant
Eternal Darkness: Sanity's Requiem
Mario Party 4
Metroid Prime
NBA Courtside 2002
Star Fox Adventures
Super Mario Sunshine
2006
Excite Truck
The Legend of Zelda: Twilight Princess
Wii Sports
Wii Play
2007
Warioware: Smooth Moves
Fire Emblem: The Goddess of Dawn
Super Paper Mario
Mario Party 8
Big Brain Academy: Wii Degree
Pokémon Battle Revolution
Mario Strikers Charged
Metroid Prime 3: Corruption
Donkey Kong Barrel Blast
Battalion Wars 2
Endless Ocean
Super Mario Galaxy
Super Smash Bros. Brawl
