I don't know, I tend to think more optimistically than many here on this point.
I do think Chris Larsen prefers startups. I think he likes the challenge of trying something new and different, pushing the limits. I don't think he likes the daily grind of continuing something already established. However we might feel about Prosper, it is no longer a new startup.
I wouldn't be surprised if soon he's head of some different startup, testing new waters.
I've always thought Chris Larsen was a dreamer. And I think the world needs some dreamers who are out there doing some dreaming.