I think when you get to that point, you should start mining for fresh talent. He should be nurturing up and coming storytellers with fresh vision. And, ideally, he would inspired in turn and have something new to say. But yeah, that's anyone: Directors, writers, artists, musicians, comedians... make enough material and you run out of shit to say. And it's obvious you have nothing new to say. I was just thinking that with Hajime no Ippo, which I'm re-watching to the nth time. The story is perfect at 76 episodes. I love Season 1. With all of the other material--two more seasons, OVA, and movie--there's nothing more to say. A few things are entertaining and chuckle-worthy but this fucking manga's STILL going. Since 1989. Or Usagi Yojimbo. I feel kinda bad for saying that one since Stan Sakai is such a talent and class act. He works so damn hard. But the damn rabbit's story isn't done yet? Since 1984? Eyeshield 21 should've ended after they won the damn Christmas Bowl. It would've been perfect. It took 300 chapters to reach that goal and the final chapters should've been an epilogue of them savoring their hard-won victory. But no, we had to have 20+ more chapters of nothing. Or the Simpsons. The fucking Simpsons haven't had anything to say in twenty years.