The sort of change that people on this forum talk about is going to require a lot more than simply getting people on bikes.
I'd rather have dummies on bikes than dummies in cars. The lack of common sense of some current motorists/hypothetical cyclists doesn't change the fact that
bicycles pollute less than cars, can leave more labor and natural resources available for non-transportation uses, and can (through exercise) reduce the incidence of heart disease, stroke, cancer, and depression.