This form always reverts to US and China laws etc. you need to understand that cryptocurrencies are world wide and the USA is not the only country in the world and don't control other countries either.
Even if those countries you mention regulat or stop ICO's there are plenty more countries that haven't regulated or stopped them and all they would do is run the ICO from that country it isn't regulated in.
My country at this time has no regulation or laws regarding ICO's.
In my opinion it is still going to take a lot of time for ICO's to die out definitely with all the new money coming into crypto. Everyone wants to earn that big money fast so they will continue to pump money into these ICO's for the winning chance of getting rich.
The US and China are the two most influential countries around the world, if the US takes a strong stance against icos you can be sure there are going to be a lot of countries that will do the same following the example of the United States, however while that could be the end of icos that does not mean that will be the end of innovation, the devs will just need to find a way to gain financing to make the project a reality in a different way.