Peterisyum
The Nintendo GameCube did not fail. Who told you it did? Where did you get the info?
If it is merely your subjective opinion, then tell us, how did you reach that conclusion?
In any given generation there will always be a select few consoles that succeeds and dozen that fail
right before or after launch.
Commercial failures in video gaming
Many of the consoles that failed have some seriously awesome games (some of them exclusives).
I purchased all the consoles pictured below (still got them all). They all have something in common.
They all failed.

The Amiga CD 32 failed (A Quality Console with a great library of games)

The Atari Jaguar failed

The Gizmondo failed

The Virtual Boy failed

The 3DO failed
Sources listed within the wikipedia article.
http://en.wikipedia.org/wiki/List_of_commercial_failures_in_video_gaming#3DO_Interactive_Multiplayer
Again. The Nintendo GameCube did not fail at all (nor did the N64, Genesis, Master System, nor the Atari 2600). In fact, it sold a staggering 22.00 million units during its lifespan. To put this in perspective..
The Atari 2600 sold 30.00 million units. The Sega Master System sold 13 million units!
Seriously think about it for a second. The original successful Sega Master System sold 13.00 million units.
The GameCube sold 22.00 million units!
I find your opening post slightly provoking and ignorant.
I'm tempted to say "Why did this thread fail?", but I'll resist the temptation.