We are in NC and our DS had his ACT cancelled 3 times but we kept rebooking and he took it in October. I believe most in NC that wanted to take a test could have done so if they were persistent. We know many that took a test but applied TO as they were not happy. We also know several that never took either test, but they quickly quit after their first booking was cancelled.
For anyone that is an SAT tutor, have you seen your business decrease since Khan Academy became available? In our area, I do not know anyone that uses an SAT tutor any longer but in the past, it was quite widespread.