Then people will again start saying "we've had no accidents for years, therefore flying is really safe, so why all this burdensome regulation?". Regulation will get scaled back, something like the 737 MAX will happen again, the FAA will get beefed up, and so on, ad infinitum.
It's this sort of regulatory boom and bust that makes me feel humans shouldn't be allowed to do anything that's dangerous on a really large scale (such as nuclear power).