Mario can support an even larger land then he has. Heck, that IP alone warranted the HP treatment, with DK and Luigi each getting full lands. Pokémon would be perfect for a land. Other then that, I’m dubious of the Nintendo properties each warranting a full land. Now, a combined Nintendo land, with Zelda, Metroid, and Splatoon sections? That’s more viable.
PS: A Zelda land becomes an even worse idea when we remember that LotR is credibly rumored to get an expansion land at EU - THAT’S a fantasy property that can support a land.