Actually, foreign teachers of Oral English are highly valuable in China for exactly the purpose we were hired for, which is to help students to SPEAK English. Consistently, I have found that my best students at the university I worked at were the ones who had had a foreign teacher before some time in their education. The difference was very conspicuous. That is testimony enough. Further, I've seen students make exceptional progress in training schools I've worked at, if they were lucky enough to get moderately good teachers.