I believe that's called the Sapir-Whorf hypothesis (http://en.wikipedia.org/wiki/Sapir-Whorf_hypothesis), which I generally agree with. A universal language would change the way people think about stuff -- it's a very interesting thought experiment.
That being said, I think there is something to be said for diversity of culture, and perhaps better more fluid translation services are the true solution.
The fact that the question is still open is why (in my opinion) the thought experiment is so interesting.