One would be to incentivize other uses and values than the monetary one (I have written about this 2 weeks ago here).
The other option is, to focus on the 5% content creators, who will also comment and interact with other creators and therefore also being consumers.I think, besides what @joanaltres has said in the comment below about SMTs being the consumer friendly versions on the Steem blockchain, that we have basically two options where to take the Steemit app.