"Core" gamer, "hardcore" gamer... I'm going to take my own stab at defining these lame-brained terms.
They have nothing to do with violent games, time spent playing, or anything else I've seen mentioned so far. What they are is euphemisms for "PC gamers". And this is true regardless of platform - PC=Xbox and Playstation is a bite off of that market. So what defines them? THEY ALWAYS WANT MORE OF THE SAME, but bigger, faster, and flashier. Minimal to no fucus on innovation or fun. We've been living their dream since the early 90's! (Anyone check out the cost of developing a new PC/XBox/PS game? Glitz doesn't add fun to a game, but at least it costs a lot!! How about the number of original titles in their Top 10? Hahahah.)
Wii was (and I'm hoping just a little here) the beginning of a revolution against that whole way of thinking. There is almost no reflection of "hardcore" in their game library. I and the rest of the people still enjoying their Wii's LIKE THAT. :)
What there is in the Wii equation, is a less ridiculously priced console, better prices on games, tons of classic console and arcade games and some decent new ones on Wii Online Store, and games that are establishing new dynamics in gaming. Personally, I still dig Wii Sports, as well as the Sports and Play sequells and Wii Fit+. Those and associated titles have alone more than justified the cost of the console (and two ROM drive repairs). The fact that I've gotten a great darts game for $5 as well as a dozen or more classic console and arcade games from the online store is just a huge bonus! I do watch Netflix on it, and the seperate Netflix-kids app is a really nice touch.
I will add that the 90/10 rule of computer games still applies, even on the Wii - only about 10% of the games on any platform are really all that good/worth playing. A Gamefly account (or generally renting vs buying) is the best thing you can do for a new console. I have many good games as a result of that.
As to the f'ing article, it sounds like a puff piece for whatever software they mentioned. People (within the industry and without) pretty soundly laughed at the prospect of the Wii. In spite of the success of the Wii, some people are still trying to laugh at Nintendo and their strategy. The magazine's failure to see potential of the Wii U isn't interesting for the same reason, IMO.
If Nintendo can maintain their price point against the other consoles and deliver the new feautres and experience as promised, I see no reason that Nintendo will do any worse than the trajectory they are on - selling more consoles and more games than their competitors. And with those new features, it seems there should be a lot of new potential as well.
The hard part for Nintendo (due to their being the pioneer) is getting a third party who can - after pouring money down the "hardcore" rathole - still afford to develop a new kind of game. Their catalog of super-fun games is growing, but it will take some time given the momentum third parties have in the style of games you find duplicated across all the other platforms.