I meant that it is politically neutral. I am not sure what a neutral sound would be and why it would be desirable. Compared to lojban, Esperanto has at least two advantages. First, it is very easy to learn. It could be argued that it is easier to speakers of certain languages than to others, but that does not change the fact that it is easy for everyone. Second, it is a living language with more than a hundred year long history to prove that it works.
I highly doubt that the average person is capable of only learning two languages. Esperanto is easy to learn, it can be done in a year. After that you can learn any other languages that you like. If people learned Esperanto in school their success with it would probably encourage them to learn more languages. Unlike the current language learning experience for most...
Anyway, I don't think there's any hope for Esperanto to overtake English.