So far nobody has shown it can be eliminated from a region. To show that would require that transitional controls on movement of people end and yet the disease doesn't come back.

This is a disease in which people can be infectious yet show no symptoms. How do you stop infected people moving between regions? Do you think a "world wide effort" is going to successfully encompass places like Africa, central Asia, even Latin America? It's out now, it'll be circulating for a long time.