Youtube is a video hosting platform, its advantage is in video delivery and ads. Why would a video generation software disrupts business?

Creating realistic video isn't hard even today, you can just do it on your phone and creating hours, hours of cat/dog videos. The hard part is to find a story to make it interesting. It could be possible in the future, like automatic film making, from script to realization, but that doesn't make YouTube's business go away either.