Things like Jungle Cruise, Rivers of America and 20,000 Leagues need the space to work as their intended experience.
You can't have a jungle river cruise without a jungle river. Unless it's a simulator. If you clog the river with other buildings and pathways, it takes away from the feeling of being removed from the rest of the park.
MK can do better with its space than rip out something like this ride. Disneyland still has its Jungle Cruise, submarine lagoon and Rivers of America despite having more attractions total, even before Galaxy's Edge.