Most people here said it already; that would be a very bad development imho. But one that will happen as, at least in my distributed developer team (all continents, many countries) everyone young hates reading; chat, email, books, subtitles; they all hate it and want to listen and talk, not read & write. So it makes sense. Hope there will be choice always; I grew up with English movies with Dutch subtitles which taught me English and saw, at the same time, how awful it was to watch Rambo saying 'Ich bin John Rambo' with a flinty German dubbed voice. The horror.