Huge Load of Bull!!!
Does he think everyone that owns a 360/ps3 is hardcore or something? The "hardcore" is a very small fraction of the gamer market at best 10%
Gaming is a lot like movies... good or bad the ones that get sold are the ones people see and hear about before it comes out...
Sure its nice to have a "hardcore" cult following like with Halo/Mario/FF games but the hardcore isn't the ones keeping these games in buisness... its the other 90% of casual gamers that buy it because they heard about it!
For that reason Nintendo 1st party games will always sell great on the Wii because they advertsie them like Crazy!
If 3rd party put in half the effort that Nintendo does to sell games on Wii, they would be swimming in the same Pool-O-Cash that Nintendo is right now... All there is to it.