If it's that bad for people who don't like seeing multiple languages, why not ask for a global system where players flagged without your language in their profile are automatically filtered out in all chat channels (toggleable in preferences)? I personally love the multilingual elements of the game and peoples' attempts to communicate across the language barrier are delightful.

Just trying to imagine juggling four novice networks plus linkshells, party/alliance chat and FC makes my head hurt already, and since the non-Japanese channels will be empty all of the novices would want to be in that one anyway even if they can't speak the language.