Theme parks, become much smaller, less frequent Rides stay like carnival rides or the one like at state/county fairs.
Eventually things will pick up. Roller coasters are a hundred years old, people will still want longer, faster, different.
Somebody will link cartoon characters and theme parks.
It would just take longer, 70's maybe.
Without Disneyland write off Epcot, Magic Kingdom, et al. They won't be finished befotre Walt's death.
A failure like this probably won't kill the corporation!n. But with revenues lost see fewer movies, tv shows.
If Jungle Book had not been a sucess the animation division would have closed. That would probably occur.
No animation oscar, no Pixar, Bluth or Dreaworks maybe because no continuous inspiration and the powerful Disney corporation is less so.
OTOH, no Black Cauldron.
The Black Hole probably still gets made, though.
Other ride movies would not though, of couse. No Pirates, Haunted Mansion, etc.