Oh gawd, I sure hope not. I'm not down with the New World Order, sorry.
Too much homogenization is no good, I tells ya. If we have one people, one world, one government, then where do you go if everything goes wrong? There's nowhere to hide.
If you have a field of wildflowers, different grasses, plants and bushes and yams and rutabagas and all that, and all the different types of little animals running around in there.. does the field die if the rutabagas get a disease? Prolly not. But refine that field down to just rutabagas, "all-one", then your all gets wiped out by the one killer rutabaga disease and there's nothing left.
That analogy might not be perfectly apt, so let's invoke Hitler. That gets everyone listening!
Yeah, so we've got this one-world one-people government, and Hitler comes to power. Oh wait, he's long dead. Let's call him Shitler, then. Shitler comes to power. Who's gonna overthrow Shitler? That's right, no-one. "Oh, but with one beautiful perfect world that would never happen!.." ... well, let's hope that's the case. Hope seems to be what gets us by these days.. ugh..
Of course, if we've got a zillion planets and all that sci-fi stuff, it's a bigger scale, so 'planet' prolly doesn't mean what it does now. But if we're dealing with the real world here, I totally agree with mean ol' God in the "Tower of Babel" legend (tho I'm not Christian) - basically, the idea is that everyone was coming together and building this great new monolithic reality, learning each others' languages and becoming one people.. and the Man Upstairs gets angry and smashes the whole thing and does some kinda god-magic so people can't understand each other anymore. Good move, God, you asshole! Cuz, see, different peoples and different countries and religions, and yes, WARS too.. that's what keeps us all alive. Put us all in one basket, and, well, that's a pretty scary risk to take.