The park has been open 42 years. A country has not been added in 36 years. I think it's safe to say Disney has no interest in adding more countries, just renovations and additional attractions. I'm okay with that.
We have representation in Animal Kingdom for Africa, Asia and coming is "South America" influence. Honestly I'd rather see an Australian section in Animal Kingdom with "Living Seas" relocated there as Great Barrier Reef and do something better in Epcot at that Pavilion.