I know there's been on again off again rumors for the last decade of closing the Planet Watch and just keeping the hospital stuff back stage. I imagine in a post covid world of budget cuts getting rid of the guest areas of Planet Watch would get rid of a lot of extra cast with relatively low negative effects on guest satisfaction.
The Goats are the main draw of the petting zoo. Moving them to the safari would be saving the biggest "loss" of Planet Watch closing.
Plus, that would give a decent sized expansion pad for Animal Kingdom after budgets start to rebound enough to start building new things again.
Obviously I would prefer that nothing was closed until they are ready to start construction on a replacement. But Planet Watch isn't exactly the most popular thing in the park.
(None of this is inside info. All my friend of a friend, grain of salt source has said is they heard a story being added mostly through script/narration changes with maybe small additions towards the end that may or may no include animals. This is just me speculating)
I don't think Planet Watch is a feasible area for an expansion any time in the near future.
Even ignoring the fact that it would require moving all the veterinary facilities elsewhere, there's no easy way to get people up there. Get rid of the train and build a path and that is a long walk through nothing both there and back -- keep the train and you're severely limiting access. They'd have to do a ton of other construction at Animal Kingdom before it would make sense to build anything new up there.
Some of that area also abuts the Safari, and they really can't build anything there for animal welfare purposes.