With 'The Host ' I think the actors could be really big names. That would be cool. I'd love to see Robert Redford put on a beard and be Jeb he would be amazing... Matt Damon has some very Jared-esque qualities and then Casey Affleck as Ian and Ben Affleck as Kyle. Imagine the interplay.
Probably nothing serious or worthwhile can be accomplished without one's willingness to be alone for sustained periods of time which is not to say that one must live alone obsessively.
