There are going to some problems with this ruling. To begin with, "entertaining" pro-am partners obviously requires more than a beginner's knowledge of English. Even with a working knowledge, part of being entertaining is a personality issue. For example, many white American pros have no trouble with the English language but have little or no personality when it comes to "entertaining" sponsors and pro-am partners. So, the Korean women may simply not have the level of comfort, cultural knowledge, nor the personality such that they will ever be very "entertaining" to their playing partners as sponsors would like them to be.
Also, let's be honest: it is not really "proficiency" in any meaningful sense that the tour is looking for but a simple fundamental level of "Where is the store?" English comprehension and speaking ability.
Third, if a Korean tour player is ever suspended, despite her best efforts to learn English, don't be surprised if she files a discrimination suit, where her English-speaking attorneys will point out that she qualified to play the tour but is now being discriminated against because she is not "proficient" in understanding or speaking English and cannot reasonable be expected to learn such a demanding language while she is trying to earn a living playing golf.
Fourth, although it would be blatantly disriminatory, why should the LPGA not simply put a quota on the number of Korean players allowed to earn tour cards? If the issue is that the tour is being over-run with non-English speaking personality-devoid robots of a different culture and language and that is not what sponsors want, why not just limit the number? There must be a legal way to do this if that is their objective.
Don't get me wrong: I'm not saying that it would not ultimatley be discriminatory against Korean women players, only that the Korean issue is apparently fundamental to the future of the LPGA tour and this language requirement may not necessarily solve the problem.
And finally, my thread on "Don't Be a Fool: Don't Quit School" for the college kids now has another international rationale: Enrolling Korean girls in high school/college BEFORE being allowed to qualify for the LPGA--they would all take English comprehension and speaking classes as part of their curriculum. If they did, this issue would be nipped in the bud before the girls ever come over--and the LPGA wouldn't have to resort to "proficiency" exams.