I really don't think it's going to be a problem (speaking a a mono-linqual English user).
- If you only know English you are going to post in English. Situation normal. No harm done.
- If you have English as a second language you are still going to post in English because it's the language understood by most monks... and you want most monks to read your posts (because that's the way to get your question answered, or your point made, our your XP enhanced ;-) No harm done.
- If you don't have English as a second language (at least, not enough to write questions with) then you wouldn't be contributing to the English site anyway. Posting in another language isn't going to lose the site useful information because the author cannot post in English. So no harm done.
I really think people are making a big fuss over a non-problem ;-)