The thing that is going to kill quora is an audience, an audience outside of the current VC circle jerk they have. The big problem with that? 200k monthly uniques is NOTHING, and the quality is already massively suffering.
Open an account. Create a biography. Attempt to add more interests (or whatever they call them)--- Presto watch what you created (the biography) disappear! Not only do they not have the answers to the questions asked, they don't have the answers to the bugs they have raised.
I've gotten some really useful and sometimes entertaining information from Quora, but I think they do have a bit of an identity crisis. I often find myself wanting to answer questions with a link to Wikipedia, and then I wonder whether I'm wasting my time. However I do find that I can add value answering questions in my areas of expertise, so that's a bit rewarding.
Quora makes a big deal out of WHO answers your question, not just what they answer. This skews the usefulness of Quora to areas with a lot of idols and self-proclaimed thought leaders. Right now, only show-business and VCs come to mind.
and Movies.
Well, they can automate all the answers with machine learning. That's not impossible.