It seems like they asked the wrong question. It's not about how many people want to watch archived video, it's about how many people want to make an archive of a video. That said, I wonder if the amount of money they save is enough to offset the users they lose to other services.

I think the question they asked was "how much does it cost to host all this video?"

Then for their post, they answered the question they wished they were asked, like a politician does in an interview.