He makes appearences but a bunch of other scientists do as well. It's an interesing documentary and no, Michio or any of the scientists dont have a major role other than explaining whats going on.
Indeed, a very insightful documentary. But, we first must get rid of superstition and all those other "Religious Fundamentalist" ideals before we head into space. Nonetheless, I quite like it.
I would bring up that video again, about how nothing can destroy a level 2 civilization or higher, because by that time, they can move to any planet they want if their planet is endangered of being destroyed.
Sure it can. I mean, the chances of it happening are incredibly small, but still, it's not impossible.
The Universe is expected to implode in another 18 billion years, or keep expanding until the Big Rip occurs.