I don't see how the Gamecube is dying. I've had more fun playing Gamecube than I have with the others. It was the same with N64 for me. I don't know why, but I just had more fun with it than the others.
I'm sure Zelda will sell pretty well and we don't know what else is coming out. Everyone's so focused on Zelda.
Why are gaming systems already talking about their next versions? Geez the new ones just came out.