I suspect you chose the topic because of the recent developments at Steemit Inc. I suppose we will get some form of advertising in the future, but hopefully it will be a smart one, for the better indeed.
I read a while back a post debate about this, the idea was that if ads were in the internal ecosystem, then that would work, i.e. posting ads only toward another Steemit post/user.

Not sure how much would that help with fiat revenue though :/