It's going to have the same effect as a ban.
Until now nothing has gone past the SEC approval and certainly no shitty ICO is going to pass through the SFA.
Fortunately, there is no need for a ban anymore.
People have started to understand that all those tokens are just useless, and the sums put in there are getting smaller and smaller.
I've checked a few ICO's (I won't name them here) that with all the spam and their "projects, whitpapers, roadmaps" haven't managed to get more than 10-20 ETH in a week.
Trust me, we won't see any ICO approved by the SFA