That is true...and at this point, Steemit is not a competitor for Facebook....the new fork, from what I understand is moving towards Reddit which has over 450M accounts.
Also, DTube is going to make a bit of a dent in YouTube. That is probably the one app which can take from the centralized model very quickly...it is a low learning curve and offers the same service less ads and corporate censorship. Of course, there are no where near the viewers on DTube as on Googles flagship site.
I support @dtube and I think their interface for uploading videos is superior to YouTube's.
If I post a popular video on YouTube, it will continue generating revenue over a long period of time. With DTube, there's only a 7 day window for SBD/STEEM revenues, so I think it's niche will be with current affairs content and vlogs that give updates. Or is there an advertising component that would make it attractive for long-term revenue generation?