I think that the only disadvantage of steemit is that you can't use it on your mobile device. The mobile version of the site looks really weird and you can't really use steemit at it's full potential. Nowadays almost everybody uses their smartphone more often than their computer so steemit will get bigger if we could use it on the mobile devices.
So, who wants to become a millionaire? I think that making a mobile app for Steemit will change the way we use our mobile devices because instead of spending hours scrolling on Facebook we could read and write interesting things on Steemit while making money. I'm not into app developing so maybe someone will see my post and develop a Steemit app.