I think you have hit the nail on the head with your comment. There are going to be various websites, blogs, forums and community networks all powered and monetized by Steem. The sky is the limit for anyone who can think out of the box.
While all these sites will use Steem to power them Steemit will be the mother of all sites.
This is something that cannot be accomplished by any other social network or website because they cannot provide the means to raise capital using their currency. So now not only can you earn on Steemit, but you can also earn more with your own online community.
How cool is that!