Do people here think that the peoples of Earth could be unified?

Can the seperate countries, governments and cultures of Earth ever form into one 'team'? Shall we ever have an Earth Flag? Shall we ever just call ourselves Earthlings instead of Chinese, Arabian, Mexican etc?

What would it take to acheive this do you think? Is it even possible? If so, how probable is it?

If countries are able to be run by governments, with one leader at a time, would it not also work for the world as a whole?

Can the Earth and Human society ever unify? Would the world be able to operate in this manner? Why? Why not?