The gorilla did not check into the zoo like it was a luxury hotel. He was captured or bred to be there for a profit. A certain minimal set of standards is required for such exhibits to protect the public and the animals. The question is was this zoo in compliance? (I have seen my daughter get out a measuring tape at a zoo) Were their credentials and certifications up to date? Most the habitat improvements you see in a zoo are not because the management would like a nicer exhibit, but to remain in compliance with regulations. Accomplishing both is a win-win. That's the goal.
If the zoo was in compliance they have nothing to worry about. If not, they are in big trouble. Either way a review will be done in accredited zoos for resulting changes which may be needed to protect the people and animals.
I do agree the zoo needs to be up to standards and then some. Sounded like this child didn’t have a hard time getting in, the zoo was depending on the drop off to keep the gorillas in but what about keeping children out? Fail on that part of it.
I take several children of all ages to a zoo several times a year. It is my responsibility (along with other adults in our group) to keep track of the children but with that said I would hope it would be harder for a child to get in that situation.