I think he's living in his own bubble a bit. Movie critics would point this stuff out? No, they wouldn't. Look at Disneys upcoming movies:
https://screenrant.com/disney-upcoming-movies-list-release-dates/
Did the audience care? No, the Beauty and the Beast Remake, which is 1:1 the same film people had already seen a gazillion times when they were younger made a billion dollars at the box office. And please tell me Jaffe didn't watch it, cause I don't believe him. He's a huge Disney geek, of course he was 'part of the problem', as people like to say.
TV? Same thing, a cool concept appears once in a decade and then a show goes on for 8+ years with the same core formula if it keeps being successful.
At the end of the day, I think the lesson here is that people sometimes like to kick back and consume entertainment where they know what they're getting.
And the thrill of making a sequel is actually to perfect the formula. I could take a video of Super Mario Bros. 1 and compare it to Super Mario Bros. 3 while making the same statement. "Look, in both games Mario grabs a mushroom and becomes Super Mario! It's the same fucking game!" -> And no, it's not. It's a different take on the formula with lots of new features where developers tried to polish the formula to sheer perfection. Apply his mindset to game development and we wouldn't have gotten some of the best games ever made.
Don't shit on sequels. Sequels are okay. It's not like sequels are all we have, there's also completely inventive new indie games out there. People will always create new stuff as long as they live. I'm working on a sequel to a popular game right now where we're trying to perfect the formula and I feel great about it. Especially because we got hundreds of mails from fans begging for a sequel. And meanwhile, by the way, I'm also working on another project that's completely revolutionary and new and will hopefully push other genres forward. Why can't we have both? As long as people get good entertainment, everything's fair game. If you don't like what's out there, vote with your wallet, problem solved.