Why not buy laptops that don't have cameras? They exist, and doing that would at least help to add economic incentive for the continued production of them.
That's almost certainly true. I wasn't asserting that purchasing laptops without cameras would make Apple (or anyone else) suddenly get off the camera train. I was asserting that if you (for instance) buy a Clevo because it lacks a built-in camera, that will encourage Clevo to keep making them.
I don't know the world of Apple machines, but at least outside of Appleworld there are several cameraless options out there from major manufacturers. I assume they're sold mostly to businesses, because I've worked at a few companies who only allow machines that don't have cameras and microphones built in.