The Ancient Greek sagely mentioned:
A few hours per year in an aerobatic trainer should be part of maintaining currency and is not expensive.
My feeling is that if all airline pilots did this then some would likely die in the process since GA flying is quite a bit more hazardous that airline flying. It might reduce the total deaths from air travel but at the expense of increasing the occupational hazard of being an airline pilot.
Would that be an acceptable trade off?