At the same time, self-voting is crucial for many business models and not-for-profits. Honestly, I believe Steem will have to be adopted by businesses and content producers before the wider internet community gets involved.

There is just not a lot of incentive right now for the masses to join, but content producers can benefit right now. Its commonplace for content producers to give away stuff randomly to their audience for retention. There is an advantage for content producers that reward their audience with small STEEM/SBD rewards in upvotes for comments. The same is true for any online business.