>as crucial as language is, a single one will be dominant..

Dear Michaelo,
That's exactly the crux of the matter! If my personal "dominant" language happens to be dominant worldwide, i.e. english, I shall probably not feel information deprived unless I am a word-maven. In all other cases I think that cultivating at least a second language is absolutely vital, since, in the present age, language is used to ACQUIRE knowledge even more often than to communicate. Furthermore, given the mutual influence between languages, I doubt if you can be a true master in one language while completely disregarding the others.