Interesting question.
I think that they don't sell as well as they used to. All major changes in human consciousness happens over a long period of time, but IMHO we are moving into a more peaceful human consciousness.
Fifty years ago most parents thought that negative consequences prevented bad behaviour. Fifty years later most parents know that positive reinforcement prevents it much better.
There will always be people that feel they need to feel superior to others but in general I think the trend is going in the more positive way.
Brad