Banning is not a big issue. ICO can find another place to world. Moreover, many experts believe that this ban is only temporary. Everything will be back to normal. AS you can see, ICO can bring a lot of money to a country and China will not miss this opportunity to earn money with ICO. Maybe they will develop their own project to run their own ICO for money.
I do not think this is going to be a temporary thing, the SEC did the same, and while further regulations may follow I doubt many icos will want to comply with all of that, it is way easier to deny participation to people from those countries and be done with it, besides is not like the Chinese government earn anything out of icos, so it s very easy for them to ban them.