Board Thread:General Discussion/@comment-1031724-20161020032419/@comment-1031724-20161101071837

And why all of a sudden? That was 15 years ago yet that kind of ending only started to decline last year. Disney movies and Supernatural don't do it anymore, unless the villain reformed first. The most recent death of a main villain, aside from the upcoming Lysandre, has been Emperor Nogo in Glitter Force (August 26th 2016).

I think the reason it's becoming rarer in both family-friendly shows and mature ones is that people are starting to find it too repetitive, despite the fact there are a variety of ways it can be done.