I'm going to repost something I stated in another thread as it pretty much sums up my thoughts on the subject of "hardcore" and "casual" gamers and how people love to throw those terms around, especially when it comes to Nintendo:
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First of all there will always be a "hardcore" group of gamers... like people who buy several games a month in order to show their support for their fav developers, or follow the industry like a sports fan follows their favorite team (kinda like us lol). I mean, hell at least 90% of developers out there would probably consider themselves "hardcore" gamers so that division of gaming is not going to go anywhere. And over time I think that the overall percentage of game players who consider themselves "hardcore" will increase as more and more people get into gaming and play games regularly as their #1 source of entertainment. Yes, Nintendo and, subsequently, the Wii and DS appeal mainly to the "casual" audience out there today, but i can clearly remember back to the days when Nintendo was synonymous with videogames... when my uncle got an NES for X-mas back in the day, everyone in the family including my grandmother played Super Mario Bros and Donkey Kong till the cows game home.
Everyone was into Nintendo back in the day, and to this day I'm sure that you all have at least a few relatives who will look at you like you have 8 eyes if you start talking about 360 or PS3, but if you bust out an NES they'll go apeshit and start playing that thing as if they never put the controller down after all these years. So now with reguards to the whole "casual gamer" thing, all the Wii is doing is starting the cycle anew, bringing in more people into gaming, and it's successor will most likely be more of a powerhouse console now that Ninty has a bajillion dollars saved up from Wii and DS sales, so surely they can put some money into making a more powerful system. Same thing that happened with the NES... they sold tons of consoles and games, and when it came time for its successor, the SNES, Nintendo was able to make (what was at the time) one of the most powerful pieces of gaming hardware and a showcase for the future of gaming. I'd also say that the SNES was also geared more towards the "hardcore" gamer with it's epic line-up of RPG games and tough as nails action and platforming titles, and I expect Wii's successor to follow in that path.