As for here in Germany specifically the sales of Gamecube grows 1000% after price cut. I just waited for that moment after being upset when price drops for the N64 from 399,- DM to 299,- no 2 weeks after launch. I think it won't get a way lower the current 99 EUR.
Over here there is no such run on the XBOX. And I would never ever buy this crap. You can buy PS2 and articles for it in every small store or super market. But for XBOX and Gamecube you'll need to go to certain shops to get your money off. It's no problem to get BBA. And I would like to see online support in games. Just imagine what Mario Kart could have been. It could have been the killer game for online gaming on GameCube (together with F-Zero

). It's a real lack it's not in there. It's also sad and true that the 3rd party support isn't big or perfect. EA's having a exclusive deal with Sony in fields of online gaming. I won't buy castrated games so EA's must get enough money from sony since they won't get it from me and a "few" others.
In my opinion not the online functionality should be profitable. I don't like the aspect of paying endlessly for a game even it makes fun to play. It should be instead one MORE feature of the game to push sales numbers - and that is where the profit may come from.
Since SNES CD-Rom extension (they advertised it here at launch of SNES to come), and the N64 DD (thank god this crap didn't made it to Europe) I simply don't believe ANY promise held by Nintendo. If it's not in or available at start it would not be broadly supported.
As far a "connectivity" to GBA concerns. This has yet to be shown it's usefull. All features yet implemented in the game only get unlocked (NES version in Metroid Prime for instance) or is rather useless (Zeldas Twinky Dinky Winky monitor). It's just to make profit - and that a side of Nintendo I don't like to see.
I have not much time left on playing Zelda to the end. I just have Metroid. These both made me buy that console (and a 20% discount

). When I'm short in time and a friend of mine is here I'd like to play Super Monkey Ball too. It's great fun.
But then? The Gamecube is the first Nintendo Console I'd like to buy a lots of games for. But just that game perls. After F-Zero (when it's players choice) it's get empty on my wishlist and on the horizon there aren't really big blockbusters to come.
Anyway I'am happy with my decision to buy the GC but I definitivly like to have more online games available.
As for sports. Since here in Germany real football is more important than american football and baseball I'm happy to choose between Pro Evolution Soccer and FIFA Football. Wait that's from EA and EA is evil. I'm happy to choose between Pro Evolution Soccer - I mean to buy it or not

!