Steemit and replacement... Good question. I think it'll be more like Steemit getting competition, whether that be an App build on EOS or some other blockchain. In the end, Steemit will get competition. And the question is then: Is there enough bandwidth in the market for competing services? Is Steemit leading heavy enough to be the FB of the Crypto world? Is the service that what is to expected from a Social Network? Time will tell, but I know for a fact Steemit will get competition.