Now that Mario Odyssey is out many of us have already started wondering what Nintendo should do for a possible sequel. Most agree that the Cappy mechanics and world structure can be expanded upon, but how do they avoid being redundant? Galaxy 2 is a great game, but also very similar to Galaxy 1. Nintendo could continue its world tour gimmick and enemy capture, but it might not have the same magic the second time around. There is novelty in capturing goombas, koopas, and chain chomps this time around, but by SMO2 we will be saying, "Oh great, another goomba puzzle." Mario visiting a real life New York city is a breath of fresh air, but where is he supposed to go next? Boston? LA? BORING.
Therefore there is only one logical solution: interdimensional travel to the other Wonderful Worlds of Nintendo™. Instead of visiting places inspired by real-world locals or traditional Mario-esque stages, Mario could plop himself smack dab in the middle of different Nintendo games. This would give Mario a completely new array of enemies to capture. Mario could visit Hyrule and take over Lizalfos, Poes, Moblins, Wallmasters, Octoroks, Lynels etc. Or imagine a Metroid.... WITH A MARIO MUSTACHE AND HAT. Not to mention the sheer abundance of options you could have if Mario visited a Pokemon world. You know how people want Pokemon Switch to be a fully realized 3D world you can interact with in new ways? What if we had that... BUT YOU WERE MARIO.
Having every world only be Nintendo focused might be off-putting to more casual fans who only play Mario, so I think you could still have a mix of Mario worlds, real worlds, and other Nintendo worlds. So what Nintendo-themed worlds would you like to see Mario travel to? What enemies could he possess?