As long as they have hentai they have no need for an army.
kekekeke
No, really, they'll probably have an army of some sort someday. Very little of any kind of treaty or such is permanent. It'll get old, people will forget, people may just not care, and they'll make themselves an army. As long as every other country in the world has an army, it's stupid not to have one. On the other hand, the world may be a better place if there were no armies, but there won't be any country to be the first to say, "Ok, we're not going to have an army anymore because that's just stupid." They'd be too scared of getting pounded by some other country with an army. And the arms race continues.