I think $30 is much more sustainable for high profile family fare PVOD releases such as Mulan. I think it'll actually do pretty well and like
@DK745, ESPN+ does this with UFC at a much higher price and a whole bunch of people buy to watch the event.
Think about it, if a family of 4 goes to a movie at an average of $10/ ticket, they're spending around $40 + tax before concession. So for a AAA family title and concessions are already at your house (hell, you could watch with a whole dinner), $30 is still a steal, especially if you have more than 4 people who are going to watch.
I still don't see how it's successful unless the other theaters sign on and so far none have and have put out statements saying they see no business sense in the deal.
Remember that the theaters weren't mad that Universal put Trolls World Tour on VOD. They were mad that Universal didn't tell them they were doing it until the last second. For all we know, Disney has been in active negotiations with theaters about this and they will be getting a cut of the PVOD.