I could see this being of interest to younger folks -- "virutally" watching a film together and chatting about it.
But I suspect the intial application of this will be pretty clunky. And as someone who's a lot closer to 40 than I am to 20, I don't see myself using this at all.
(If they did it with a Criterion movie and a class of film students, *that* may get me interested... but I don't think I need to watch the movie while people are posting about how "Hagrid rox"

)