It was only a few years ago that Google search was all the rage. :)
There was a lot of turnover in search before Google. There was a lot of turnover in social sites before Facebook. So Facebook sticking around would not be unprecedented. All the failed giants of the past eventually fail, except the last one.
On top of that, I think Facebook has innovated (ok, at least iterated) more frequently and intensely on their basic offering than nearly anybody. Compare with Google, where we went from search results with ads to search results plus 3 thumbnails with ads.
There was a lot of turnover in search before Google. There was a lot of turnover in social sites before Facebook. So Facebook sticking around would not be unprecedented. All the failed giants of the past eventually fail, except the last one.
On top of that, I think Facebook has innovated (ok, at least iterated) more frequently and intensely on their basic offering than nearly anybody. Compare with Google, where we went from search results with ads to search results plus 3 thumbnails with ads.