Firstly, you shouldn't trust everything you find out on the net. There are rumours flying around about EA pulling it's software from the GameCube yet in the recent interveiw with Miyamoto there was something said about Nintendo working with EA. There were also rumours about Codemasters stopping GameCube development, but if you look at news on this site you will see this isn't true.
Now onto my main point.
GameCube didn't sell as well as expected by Nintendo last. This doesn't mean Nintendo are in trouble in any way. It just means they didn't reach the profit levels they thought they would (which were very high anyway). The problem is that people assume too much. They don't wait until they know everything and post the bad news on various web sites. Things keep on going on like this and things escalate until there are various rumours going around the internet.
This should have taken the post in a complete circle so I will stop now.