Gas is more expensive. Disney is having to pay signing bonuses to get employees back to work. I'm sure lease payments will be higher if Disney needs to replace or add vans.
I agree completely bring them back!! I loved using them on my last trip in 2019 from the airport and around property. I don't care the price- they're safe with the car seats, convenient, and so adorable! I'll be at Disney in a month and this would seriously be awesome.
There are pics floating around this site of new Minnie Van signs being put up on property so I would expect they will be back. When is the big question that no one has an answer to at this time. I would guess September, this seems like something they'd want in place for the 50th.