That was a lateral technology move. GBC games would still run on the original Game Boy.
GBA didn't sell as many units as the original Game Boy.
What I meant by a "faster Gamecube" is a machine that basically takes the same philosophy of design as Gamecube, but basically put new silicon in it, much like the PS2 was the same design philosophy of the PS1, but with much more modern silicon. I think that should have been obvious given the context of the discussion (and the many discussions we've had on this board), but it obviously wasn't, so now I'm explaining it.
There was a sharp distinction. Hardcore gamers played complex games on home computers like the Commodore 64 and Amiga. The NES was for children and idiots.
I would roughly define the "hardcore" as gamers who believe that they belong to an elite class of gamers and mentally set themselves off from the majority of gamers, whom they regard as not being real gamers. It's an attitude, not a class of video games. When applied to games, it means little more than "A game that I, a hardcore gamer, like," which just confirms that it's really an attitude more than anything. That seems to be the only consistent, workable definition.
I think the N64 and the SNES were all about catering to the core. And in my opinion, the N64 was more "hardcore" than the PS1. The PS1 was designed around appealing to people who previously didn't care about gaming by impressing them with cinematics and epic sound tracks. To a hardcore Ultima fan, Final Fantasy VII was practically a "non-game," a terribly easy, simplistic affair with more focus on pretty pictures and movies than being a true RPG. You don't have to look hard, even on this forum, for people praising Playstation for taking gaming "mainstream" with its cinematics and media playback. But when Wii makes gaming even more mainstream with its intuitive controller and social games, suddenly, cinematics and epic soundtracks define "hardcore," and we don't want the mainstream ruining gaming (news flash: the hardcore SHMUP and RPG fans thought that the Playstation ruined gaming). Having lots of non-gaming functions is good when it's movie and music playback, but bad when it's having a brain training game.