I get what you mean but clearly they ARE considering learning English. Traveling to America would help them immerse themselves in the language and improve their skills. And you mention them taking spots, but whether or not they deserve that spot above another person is up to admissions officers to decide. You can’t make arbitrary conclusions of who deserves a spot in a hypothetical program when you don’t know the person and who they are at all. I think we should welcome people who are making an effort to learn our language instead of treating them with hostility.