Just a novelty that will fade off. I cant see any useful purpose for 6 second clips in a social wide audience context.
As much as I dislike them, I also think they'll take off.
I can see them as another Instagram-like "useless" thing that is none-the-less popular because it's quick, illustrative and requires little effort. Think an animated GIF-like snapshot of your day.
(Bah humbug, etc.)