I definitely bought my GameCube because I thought it was a quality system (and I think it is)--by no means just for Nintendo's sparkling titles like Mario and Zelda (I'm guessing) and Metroid. And, Egman, like you said, it would be cool to see Konami do some big games on it, of course! However, it's the attitude that Konami "owes" us something or that it would be "better" just because it's on GameCube that gets on my nerves. I don't think anyone can argue that it would be freaking awesome, but there's more going on here. And it's tiresome.
As for the GameCube, I think Nintendo has made HUGE strides on a system that's a little over a year old (especially considering the mass attitude towards Nintendo that has been discussed here and everywhere else until we're blue in the face, and worse). Time will pass, things will change, and even if they don't, I'm enjoying the system pretty much as is. Many an hour I've spent on the handful of games I actually own, not to mention the multi-player sessions I've had with friends. In the end, the userbase will grow enough that companies like Konami will come back.
That gets to my last point. People keep saying Konami used to be a staunch Nintendo supporter. No, actually, they are staunch supporters of going where they think they can make a big profit. If they don't think they can do that on GameCube right now, that's their belief to which they are entitled, however flawed or shortsighted it may or may not be.
Okay, I feel like a broken record on all this, so I'm out.