It's too slipper a slope to ever become a reality. Being a parent is not a black and white job where things are EITHER good OR bad. There are plenty of children who grow up in 'bad' households who are themselves quite well adjusted, and vice versa. If one tried to implement mandatory parenting courses it would have to be watered down to such base instructions as "Feed your child", "Don't put pillows on your child's face", and my personal favorite "Don't throw your newborn like a football".
Do some people DESPERATELY need that information? Yes. Do they account for enough of the population to warrant new government programs? I sincerely hope not.