Always will be?
The game could be rereleased. And you don't know what would happen.
He could be replaced entirely with a new, unique character of almost exact origin, but owned by Nintendo.
Or someone else.
Or something else could change.
I know I wasn't in this conversation when this dialogue happened, but I'm questioning this part of your post. None of what you said here makes any sense. Sorry for the looming wall of text, but I felt that this warranted correction.
First things first, you're assuming that if Nintendo re-releases SMRPG...
again, which they've already done twice now (Wii VC + SNES Classic), that they would go out of their way and comb over all the data of a
22 year-old Super Nintendo game, remove any and all references to Geno (which is a lot of pointless effort on their part), add in a completely new, original character as a replacement, and then sell that product with the expectation that fans will just be okay with his absence and accept all the changes that come with it? It wouldn't even be the original game anymore by definition. Or are you referring to a
remake? A modern-day retelling of the events of the game where Geno is replaced by an original Nintendo character? Again, that would bring some backlash, but more than that it technically wouldn't be a true remake, now would it? Even if they made a sequel to SMRPG (which technically
Paper Mario is) and it had Geno absent as a character (which Paper Mario does) what does that mean for Geno?
Absolutely nothing. Let me explain what I'm getting at here.
Out of those three scenarios (edited re-release, remake, or sequel), which of them
erases Geno's role as a main character in
Super Mario RPG: Legend of the Seven Stars for the Super Nintendo Entertainment System? The answer is...
none of the above. That's not how anything works. A main character of a story remains a main character of a story regardless of retelling, remaking, rebooting, or being written out of the storyline of a sequel. The original is still viable and the cast does not change magically or retroactively in anyway.
Sure, you could absolutely make a game that has one of the character's state outright that Geno is not a character in the story... but it still wouldn't erase Geno from his role in the game he was in. That new game with the "Geno is not here" remark would merely be a game that pretends that the original game didn't exist: we call that a reboot. Jurassic World did this, the newest Halloween did this, but do those movies suddenly make
Ian Malcom disappear as the main character from
The Lost World: Jurassic Park? Or do they make
Jamie Lloyd disappear as a main character in
Halloween 4: The Return of Michael Meyers? No. Maybe those characters disappear for the newly retconned timelines, but those new films don't magically scrub away the character that appeared in the older films.
Let me prove this with an easy example. In The Legend of Zelda: Ocarina of Time,
Ganondorf and
Zelda are two of the three main characters; this is undisputable. This does not change. It
cannot be changed. The game has a
direct sequel: Majora's Mask. In the sequel, Zelda has a brief cameo, and Ganondorf is never even mentioned. Now, does that suddenly undo their roles as
main characters in the previous game? No, it does not. Therefore, they will
always be main characters in Ocarina of Time.
Period. Nothing can change that and nothing ever will. Sequels that lack characters from previous installments (which are common) don't suddenly make those absent characters
not main characters of the previous storyline. Reboots or remakes that remove characters don't suddenly make those characters not main characters of the
original storyline.
This applies to Geno, too. In his starring role, he was one of the main characters. This does not change. It cannot change nor will it ever change. It's just a fact of the universe. So, as was said before:
He's a main character in his game. Always was, always will be.