If someone were to suggest that Facebook will eventually fall, the raw data from this quarter will not provide a sufficient argument. My argument would come from the idea that Facebook is currently acting like a very greedy company, with aggressive publishing of advertisements and aggressive policies that may eventually scare away the user base.
Especially with the internet becoming increasingly aware of the lack of privacy vs. the usefulness of privacy, it would be easy for Facebook to end up on the list of "bad guys" if they don't tread carefully. My prediction is that they will eventually overstep their bounds in greed, but it's too early to be comfortable with that prediction.