Could the entire world come together under the concept of a "one world state"?
One way to think about it is "me" living in a world that is anything but unified, and the other is to think of it from the perspective of the next generations that will, as time goes by, come to live in an increasingly singular, connected world. To them, it's not a matter of can the world be made one. It will be more and more that one.
Whether that's a good thing or not I can hardly say. You'd think that if there was only one world nation that there would cease to be fights and all and we don't have to pay for things like huge, overbearing armies, but...is that pessimism or rosy thinking?
Time will tell...