In 2003 Baten Kaitos director Yasuyuki Honne proposed to Nintendo a new Mother / Earthbound RPG for GameCube, but in the end the game was cancelled. This project was pitched in summer 2003, just a few months before the release of Baten Kaitos: Eternal Wings and the Lost Ocean, possibly to become their following collaboration between Nintendo, Monolith Soft, tri-Crescendo and Namco.
While Earthbound for GameCube was never officially announced, in July 2019 Honne shown a couple images from their pitch-document on Twitter:
As you can see the game was imagined in a quirky felt-made diorama graphic style, that would have been somewhat similar to classic Earthbound promotional clay models. As translated by Nintendo Everything:
“I’m looking forward to the forthcoming book about Iwata-san. I met both Iwata-san and Itoi-san at the same time – it was back in 2003 when there were talks between Namco and Nintendo about a GameCube version of Mother. I was happy to come up with a visual concept, and when I went to Aoyama Iwata-san was also present. Itoi-san didn’t seem very interested; he felt it was a little strange, and yet we continued talks. Itoi-san said, ‘I wonder if Iwata-kun has any ideas?’ He seemed flabbergasted, he had an aura of something akin to ‘Aw jeez.’ In the end nothing came of it, but Itoi-san enjoyed the felt-like recreations of 1980’s America that I had come up with. Here are some images that I didn’t think I’d show off more than once. Ah, memories of the summer of 2003.”
Unfortunately it seems after the cancellation of Mother 3 for Nintendo 64, they were quite cautious about working on a new 3D chapter. 3 years later, Nintendo published Mother 3 on GBA and Yasuyuki Honne’s Baten Kaitos prequel (Baten Kaitos Origins) on GameCube.
By knowing what Monolith Soft were able to achieve with their RPG series, we can only imagine how much we lost with the cancellation of this “Earthbound GameCube” project. The Baten Kaitos team also had a third Baten Kaitos in development that was later canned, but they successfully released other beloved games such as Soma Bringer, Disaster: Day of Crisis and the Xenoblade Chronicles series.
You can take a look at the Sedna city in Baten Kaitos Origins (a strange world made of clay) to imagine how Earthbound Gamecube could have been like.