The only positive I can see coming from this would be the benefit to law enforcement. The child is found sooner, thus crime evidence is fresher, easier to determine cause of death, etc. rather than clues going cold week after week. So I can see law enforcement pushing for this. But I doubt it will result in protecting more children. Stupid idea.
If you are going to murder your child put her in a garbage bag and dump her in a swampy wooded area, are ya really gonna obey THIS new law? I think not. I agree with you, it is a stupid idea.