A side-note just while it is relevant. Is it possible for any zoo to ever contemplate having all species of bear in the zoo (whilst keeping them in modern, good enclosures). American and Asian Black, Sloth, Sun, Spectacled, Brown, Polar and Giant Panda? So, that's 8 species?
Closest I've seen in Europe is that Zoo and Tierpark Berlin keep them all between them (or at least did until recently - as far as I'm aware they're all still there). Whether they are all in 'modern, good enclosures' is a different matter!