I was one of those kids with an Apple ][ and in fact I still own it. I thought about setting it up for my own kids (now 16 and 18) years ago to tinker with. But I realized that it wasn’t due to accessibility that they aren’t interested in programming. Times change and my things aren’t their things. If they wanted to program, there’s a lot of modern and accessible environments to start with. They had plenty of friends doing things like LEGO mindstorms or finding other ways to program. I realized they were no more interested in programming than learning how to change a spark plug when I tried to show them that. And it wasn’t because computing (like many other things) has become more complex.
I’m not really even sure computing is less accessible now. Kids find a way.