You raise a good point here, but before reaching this milestone (businesses pourring fresh money & buying voting power to advert their content) the platform has to gain a huge traction while maintaining the price of Steem without the help of real money and that is quite challenging.
I'm expecting the price of Steem to drop to somewhere around 0.001btc. Then we will have more clue on how people react when there will still be some reward but much less than what we have seen until now.