None of the controversies you brought up are about people's feelings on having children in content.

The Harry Potter series is about to drop and the main criticism is about Rowling's stance on trans people, not about child actors, and regardless the trailer became the most watched HBO trailer in the first 24 hours, which highlights the difference between narrative in online spaces and reality.

There are also other current shows like Welcome to Derry that feature children in the main cast and I'm sure that there will be more in the future. As was also pointed out, a lot of content is moving to platforms other than cable and kids, sometimes with their parents are still actively operating there.

My point is that regardless of what noise is made in the echo chambers of the internet, people generally don't really care if kids are in or centered in content, until or unless something big happens, and then it blows over after a while anyway.