another take i've seen is "this will just encourage people to not do captioning". O RLY. you think VLC's take-up is that broad, do you, that all the people who conscientiously put subtitles on their videos will go "oh, we can stop now, VLC's doing it for us"...?
*snort* that's little more than concern trolling, and if you don't know it, you should by now.