Im not sure about numbers, but what I fear is that people will pay out most of the steem dollars they earn. Because its so tempting to take profits which are earned in some ways just to see if they are real. I'am thinking that it is something that could drain this platforms wealth. But I hope that creators had it in mind while creating it. Its not that there won't be much steem, but how much will be price of steem is you can cash out half of your earnings in steem dolars every day.