Stop, TP was not meant to save the gamecube, do you know how game development works, even without the delays the game had, it was too late in the GCN's life to "save" it.
Twilght Princess was a game made to benefit the gamers that were already there on the system, not to suddenly get new ones.
Go read the Iwata ask :
http://iwataasks.nintendo.com/interviews/#/wii/twilight_princess/0/8
Aonuma
Well, I'm sure some people felt that way. We were continuing to do what we've always done in the midst of a change of direction within Nintendo, so I would be lying if I said that no one was worried about being left behind. When we missed our window of opportunity to help the GameCube go out in style and it was decided to also make a Wii version, things got a little chaotic. But despite that, no one ever said anything like: "We shouldn't be spending time on making Zelda anymore." No matter how much trends in the industry were changing, we had absolute and unwavering confidence in what we were making.
Something as expensive as Zelda is not meant to simply milk the existing fanbase who already got the system.
TP was announced in 2004 and was meant to be released way earlier than it eventually did, it was absolutely made to be a big tentpole game for the GC.
At the release of game of this magnitude, hardware sales are up.
Are you seriously telling me that it's just repeat customers considering stacking another console on top of their previous one?
Do you think MSFT made Halo Collection for the Halo fans who already have a xbone?
Do you think Sony pushed tLoU on ps4 only to satisfy people who liked it on ps3 and already got a ps4?
Heck what's the reason it was pushed on Wii to begin with?
To sell more Wiis (which was actually unnecessary as Wiisports was clearly enough).
Are you using Skyrim as an example for not making a series more accessible for better sales? ....Okay.
Compared to the shit Nintendo tried to pulled off during the GC and DS/Wii era? Absolutely.
Have you played their games when they try to make it easier for accessibility?
We get stuffs like Fi constant nagging, touchscreen control in Zelda and removing camera control out of 3D Mario.