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.
I would much rather pay to generate my own realistic videos based on my prompts than watch other people’s random creations (possibly filled with ads). When generation becomes great the motivation and need to store, retrieve and serve becomes less relevant.
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.