I am against it.

For me, the value of FlyerTalk is not the forums themselves (there are thousands of travel-related forums on the internet), but the community that hangs around them. The ability to communicate and socialize with folks from many walks of life and many countries using a common language is what makes this community so great.

In my opinion, introducing other languages would segregate the FlyerTalk community without adding any benefit. Those who prefer to communicate in their non-English mother language already do so on other travel-related sites. I know there are a lot of German-language travel-related forums, and I have no doubt the same is the case with Japanese and any other more or less common language. For non-English speakers who come to FlyerTalk, the benefits of a common language must outweight the drawbacks. This is certainly the case for me, and I personally would prefer it to stay this way.