I think there is a lot to discuss here.

Probably do everything in my power to ensure the gaming landscape isn’t as predatory in terms of having to pay for online access on consoles and seeing the Devil itself ( big red N ) go down in flames. Also, try to make console exclusives seen as something nobody is interested in anymore and are unwilling to purchase, more or less towards the 2010s rather than the 2000s, otherwise some of my favorite franchises wouldn’t exist. XboxLive? Find a way to fudge all the numbers to make it look like absolutely nobody was buying it! GameCube? Find a way to ensure little to no 3rd party devs make anything for it by any means possible! PSN? Keep that free like it was for PS3! Would need to spend months, if not years, to figure out how to make all of that and ending console exclusives a thing, but a world without all that, IMO, would be a better world.

Darling if you want to stop Nintendo from becoming Nintendo it’s not the GameCube you have to fuck with. You need to hit them where it actually hurts. You need to stop Pokémon. Nintendo would have died in the n64 years if Pokémon didn’t carry them on its back (and also completely change the face of pop culture by getting the west into Anime)