I can see some usage for this use case - "look Morty, I turned myself into a pickle!" - but just like image / meme generators, this is like 10-30 seconds of engagement within a friend circle at best (although some might go viral, but that won't bring in much money for in this case OpenAI).

There will be (or is, I'm behind the times / not on the main social networks) an undercurrent or long tail of AI generated videos, the question is whether those get enough engagement for the creators to pay for the creation tool.