Also... if a student does not progress as quickly because using Japanese names for techniques is not "convienent", is that really the teacher's fault? Confucious once said something to the effect of "If I give a student one corner of a square, and they cannot return to me the other three, they have not warranted further teaching"... If nothing else, something as trivial as vocabulary weeds out the "kewl d00ds" who just want to learn how to "kick some butt"...
The job of a teacher is to teach. The job of a student is to learn, even if it requires some extracurricular activity (that is, researching and *gasp* thinking about Aikido outside the dojo)