Well, You just answered Your question yourself. Steemit can only become a "one of all" community if it offers these functions and features. At the moment it doesn't, steemit is just a simple looking blog platform for now. It can't replace YT if You can't upload videos. It can't replace Facebook if it doesn't offer any similiar functions and features FB has. Its that simple.
RE: Could Steemit Become The Next YouTube?