All countries will come and go. Lines in the sand constantly change. Territory disputes come and go. Territorial lines change. It's only a matter of time before countries that have only been around a few hundred years, fall to countries that have been around for centuries.
Who knows......maybe there IS a Cabal that runs everything. I severely doubt it though, as fucked up as things have been for centuries......I can't imagine any one group having enough resources to keep an entire planet under their thumb.
As for a "one world" government...........................
We've got at least a couple of centuries before we get to anything near Star Treks version of world government.
For all intents and purposes, "one world" government for todays meaning is one government ruling everything. Like Hitler wanted to do. And I don't ever see that happening either, as ALL governments are greedy as all fucking hell, and will NEVER relinquish their power and money unless taken over or killed............or in the case of Dementocraps, sell us out to another country for money and power.
But even at that............we've all seen how that ends up. Those that sold out to the evil, got destroyed by the evil once the evil got its way.
I don't ever see any "one world" government happening in THIS century or the next.