I strongly believe steemit can replace facebook and celebrity accounts will be switching to Steemit in future. I have over 1000 contacts on Facebook and I barely use it now.
I see steemit growing in the future too but not that sure that it will take over the social media. Have you checked out ong.social and their ong coin?
Steemians! Have faith and keep in blogging and Steem up. There is light at the end of the tunnel