Yeah, I think it's evident by Paper Mario being SMRPG2 before Square dropped out of Nintendo that Geno and Mallow were probably planned to be used more. Of course, what happened has happened, and now we're years down the line without any fruit for them. They may think that now, it's been far too long and it's far too late... or they'll revisit past ideas and make something new with our boys.
Hopefully, it'll be the latter.
I swear, Twink had to've originally been ♡♪!?. ♡♪!? being the original Twink probably didn't work out because of him being owned by Square, and also the rumor going around that Nintendo wanted a portrait of Geno in Paper Mario 64 but not working out because of copyright issues with Square.
It's mean of me to say this... and I know there's going to be people going against my opinion on this, which is totally fine, but I really wish SquareSoft stayed with Nintendo. SquareSoft and Nintendo would've made some of the best crossovers and games in history, and we probably would've gotten a whole SMRPG trilogy by 2004 or 2007. If the N64 had the capability to run FF7, they probably would've stayed with Nintendo for the rest of their gaming market days, and I doubt Square would've merged with Evil-- I mean, uh, Enix. Gosh, you know what? I wish Nintendo bought SquareSoft. In my opinion, Nintendo buying SquareSoft probably would've been the best thing that ever happened to Nintendo and Square: FF devs, Nomura, AlphaDream, and Monolith Soft making Final Fantasy; Square and Intelligent Systems making Paper Mario; Square, AlphaDream, and Nintendo continuing the Super Mario RPG series; Square and Nintendo making a crossover of Legend of Zelda x Final Fantasy; the possibilities are ****ing endless. Stephen Hawking, if you are right about there being an unlimited amount of universes and there's one out there of Nintendo buying SquareSoft, please take me there.
I typed all this while listening to the Yu-Gi-Oh opening for 20 minutes... typing this felt suspenseful and powerful. LOL
If SquareSoft got bought out by Nintendo, we probably would've seen Cloud or Geno as early as Melee or Brawl. Remember that Geno and Mallow did make it in an old Melee poll, so perhaps we could've seen Geno and Mallow be their own separate characters and could've been the Mario reps of Brawl, or maybe Geno could've shown up in Brawl and Mallow could've shown up in Smash 3DS/Wii U or Ultimate. :/