First videogames were casual. Then a part of gamers got tired and asked for something more complex. Once reached a certain degree of complexity, some features started to be necessary, savegames and an hard disk. Hardcore PC gaming pioneered this, then savegames started becoming common also on consoles, although first as save points. Alas a trend rised on PC: caring too much for rich graphics and vast game worlds, but not caring enough for game controls and playability, although it was clear enough that the best hardcore games managed to have controls much better than their pale clones, and eventually this trend propagated out of PC world. But consoles still had also casual games and their public always wanted more immediateness than on PC games. This gen (and also last gen on XFlop 1), things went out of control and the path was cleared for the disruptive immediateness of Wii. After the disruptive effect settles, a new evolution will start, slowly a part of Wii gamers will start to desire more complex games and Nintendo and, let's hop, 3rd parties, will content them. At one point, there will be the need for a Wii2 with more memory and an hard disk. Let's only hope that the lesson about controls and immediateness will be learned by Sony and MS and won't be forgotten by those who teached it (again) to the world, Nintendo.
Obviously the most diehard hardcore gamers of the old school will consider the new "hardcore casuals" an abomination 
