Can't we just all agree to speak English? No, I don't think that would be a good idea. Perhaps they could write a (albeit imperfect) tool to alert readers when another language has a much larger or more comprehensive article. I'm sure the Wikipedians have considered the fact that some information is better presented in a particular language. For example, an article about Shakespeare will be more precise in English than Chinese. However, I think it would be another kind of loss if the Shakespeare article was just in English and we forced people to use automated translators. Some might argue that this applies to all scholarship, not just Wikipedia.