It takes a lot of time and commitment to blog on steemit. Many of us have thought it's just too much effort for too little return. I suspect that most new users find out that's it's not a get rich quick scheme and go back to their old bad habits of Facebook, Twitter, etc. Those of us that get it though stick around and build our accounts.
I actually think a percentage of those people will come back. One of their friends will mention it, or they will read about it on a website, or something else will bring them back for a second try. Come winter when the sun goes down earlier and it's cold outside people have more free time on their hands. My bet is Nov. & Dec. we will see a big wave of new & returning users blogging about the holidays.