A Minecraft movie could be pretty interesting, depends on what direction they take with it. If they take the old "KILL THE ENDERDRAGON BECAUSE PLOT!" cliche I'll be kind of disappointed, though. I'll keep an eye out for it.
I honestly don't like the idea of Minecraft as a movie because the base game doesn't really have a plot other than "Fight stuff and survive." I doubt it would actually be a good movie if it was made, it would only make money because it has the name "Minecraft" stuck on it.