"Gone for good" is a silly thing to say in the current situation. It's like when someone posted saying all character dining was gone for good.
The cars were aging so needed replacing - no point doing that if nobody is visiting right now. Makes more sense to suspend it for a couple of years until the parks start to recover. It's already pretty clear the parks and the company as a whole are going to suffer pretty badly for the forseable future, so things like this are the obvious sacrifice to make.