No, dumbest idea ever. That would clean out some of the best talent in the UFC and make it flock to other orgs. Who cares what they speak, are they supposed to be politicians or something? Let their fists do the talking. Translators are good enough for me, and I don't care if they don't cast non-english speakers for their reality show, but leave the sport out of it. If it's about motivating it's fighters to learn English and relate to their audience, most of the UFCs fighters move to the US anyway and are already working on their English to get by in day to day life.. this wouldn't speed things up any, and learning a language takes years.
The LPGA can afford to do stupid shit like this because nobody gives a damn about Women's golf anyway. No big sport with a serious following would ever think about losing a big chunk of it's top talent to a non-issue like this. Think about it.. no Anderson, no Machida, no Okami, No possibility of Fedor/Aleks and many more. We would never know who the best fighters in the world are, just the best english-speaking fighters.