There will be some change. Maybe not as much as there should be, but we shouldn't completely discount the effects this story will have. Next time a school administrator or police officer is about to abuse a kid for no good reason, they might pause and think, "Wait, what if this gets me in the national news like those guys in Texas?"
It's not going to stop all of them. Or most of them. Or even a whole lot of them. But there are going to be a few people reevaluating their approach.