>>718096628
I agree it should have ended with 2. But that isn't to say they couldn't have done new adventures with Sora still being the protagonist. The problem is that Nomura comes up with bad ideas.
Nomura thought invented many side games with Non Sora protagonists was good so when the story returned to Sora there would be many gaps in the plot which would confuse anyone who skipped the handheld side games or mobile games. And bringing back old characters be they heroes or villains through reviving the dead, time travel, clone replica bodies, etc has always been divisive.
How many people were happy that Sephiroth got revived in Advent Children? To my recollection fans were upset. They were also angry that Rufus inexplicably is alive and healthy despite being bombed to death in the original FF7. People don't respect "And magically the character is back to life!" bullshit.
Kingdom Hearts did have potential and I'd argue it still has potential but not in the hands of Nomura. Not in the hands of Square Enix. And not in the hands of Disney. And because Kingdom Hearts is not public domain its better off dead.