The world's populace should seek out a universal language. We are almost there with English now. When I visited Thailand and Laos, I was shocked with how many people spoke it. When I was in Argentina and Brazil, everyone knew a little and 1 out of 5 spoke it. This is good.
If everyone in the world spoke one language, we would at least all understand what each other are saying. I feel like that would bring us one step closer to equality. There would be no arguing over a superior language at least. I personally identify better with people that at least speak the same language as me.
I believe the worlds populace should seek out a universal language. I think with globalization it would be more beneficial to let this idea grow naturally rather than insist governments force it upon people. I think humans should come together on the Internet and learn one language, so we can all directly address each other. It may take a few generations to fully implement the idea.
I don't think the world's populace is really in need of a universal language. Look at Esperanto, for one thing. That was its goal, and while there are a few million people who speak it, you can hardly call it mainstream. I think the future will actually be more like Star Trek-style universal translators to help us understand one another.
It is my opinion that world's populace should not seek out a universal language. I feel that the variance of language creates a more rich environment to live in overall. Learning a new language can be beneficial, but stripping away all differences of language would be detrimental to the culture of that society.