This is why its good to read the article instead of trusting click bait titles. He actually said after the strenuous development cycle of Ultimate, he thinks it would be unlikely to see another similar increase in magnitude for the next entry.
He admits that he’s skeptical about the development team creating another Super Smash Bros. title that goes above and beyond what Ultimate did, given the strenuous circumstances his dev team went through to add more content to the game during the COVID-19 pandemic.
“As for what comes next for the Smash Bros. series, even I’m not sure,” Sakurai said. “I feel we truly succeeded in making people happy with this game, but now that Smash Bros. has grown to be monstrous in size, I’d say it’s difficult to imagine an increase of this magnitude happening again.”
He added, “Every time, we managed to make a game that I had previously thought impossible, so I can’t say for certain there won’t be another, but I do think it would be difficult to push it any further than we have.”
Also, while some fans do have more vision, they also have far less restrictions. It would be foolish to accuse Sakurai of lacking vision.