I wish one could say yes... then again, look at what's happening in Europe right now. The EU keeps threatening to fall apart, due to economic reasons, yes, but also for reasons tied to a series of smaller factors which can be boiled down to "nobody wanted to give up their national sovereignty". (Well, not entirely, but that did play a rather big factor as well)
Also, there is the cultural factor to take into account. Some countries have a culture, a historical background so different than what we are used to, that trying to impose a certain viewpoint would just create a whole different set of conflicts.
Take this as an example: in Europe, we are exposed to American culture constantly, due to the exportation of movies and media from the USA. We are rather familiar with it, despite never having been there. A lot of it are stereotypes, yes, but we still get a taste for it. A couple of very good friends of mine are Canadia and from the US, as well.
Yet, one time, we were sharing a compartment in a night train with some Americans, and we started talking about culture, and stereotypes and stuff, and all of a sudden, one of them went: "By the was, I was so shocked to see so many naked statues everywhere! We were in Belgium, and there was a statue of this naked kid everywhere, and he is... well... he is peeing! And even your government offices have penises outside of them!"
Me: "I'm sorry, what now?"
"Yes, we saw them in Rome! That would never be allowed in the US! I mean, here, you could not have them in your front garden!"
It literally took us more than a minute to realise they were talking about the renaissance sculptures that are placed just about everywhere in Rome, which in my mind don't even count as being properly naked. Similarly, when I go through the "Getting Crap Past the Radar" section on TVTropes.com, very often my reaction is: "wait, that's supposed to be censored? Why?"
it may seem like a very minor thing, and yet, if you were to impose those same regulations in Europe, people would not understand, and get pissed off. And it works the other way around, of course. It's not even a question about preserving cultural heritage, which could be arranged, but simply that there is no way to harmonise all our cultural differences into one country.
So at the moment, unfortunately, no. But in a few hundreds of years? Perhaps.