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Honestly, I want Geno less because of the character himself and more for any acknowledgment of the Mario RPGs outside of their own games/subseries.
If Geno appears in a non-RPG game, then there's a greater chance (however slim, still) of seeing characters like Goombella, Prince Peasley, or the BiS Bowser minions, etc. in other games too.
Hey, the first Paper Mario's Goomba King and Star Spirits got appearances outside of the Paper series, so it's not entirely out of the realm of probability!