Im really hoping the devs could add more variarty in the game in the case of visitors. Like some are sitting in a wheelchair, so you cant just use all stairs but have to use the slopes or maybe elevators. it makes the game more realistic for me. also you could lose visitors because its not acceseble by disabled people. and Planetzoo devs could implement something similar to the exhibit tool that allows you to see which parts of the exhibit are accesible for animals but for the guests. so you can see if there are parts of your zoo that can not be reached using wheelchairs.