It's an intriguing idea, but in the end I'd oppose it, because, if it succeeds at all, it would lead to fragmentation, with different sub-monasteries emerging around each language. In other words, I think the value of fostering a sense of community trumps the value of allowing monks to post in the language they are most comfortable with. (BTW, I don't say this out of "anglo-chauvinism"; my first language is not English.)
An alternative solution would be for those who have a hard time posting in English to post in both languages, like several posters have done in this thread, though I would reverse the order so that their best effort at an English version appears first, followed by the version in their native language, possibly within readmore tags. This is just a idea; I have not really thought it through.