My personal sign is when you start seeing awkward collaborations start cropping up. One time when I was thrifting, I picked up a graphic novel that had the Justice League, team with the Power Rangers of all things. I glimpsed into what the plot was about out of morbid curiosity and it was just a plain generic time and dimension thing.
Nothing ever connected between the teams at all. DC Comics, while fledgling at times with how they go about their series and movies, still have far more relevance than Power Rangers do. I think the Power Rangers are just grasping at straws to keep being relevant when people have largely moved on from them.
With the notable exception of Malcolm in the Middle.
Baby Jamie wasn’t brought in as any way to boost audiences, but rather because the actress playing the mother was pregnant in real life and the writers decided that instead of hiding it, they’d work it into the series.
Considering the show didn’t have any dips in quality throughout the saga, it’s a rare situation. It’s the one show I can think of where a baby was brought in and the show still felt the same (in a good way) both before and after.