ICO scam will never be able to stop popping up. that can be done when this is encountered by reporting the circumstances that happened in order that the ICO will not get support. Indeed it is difficult sometimes to distinguish a scam also and not.
I agree, there is no way that we can stop ICO scams from popping up and they are just getting more and more sophisticated as time goes on.It is not harder to tell which of the projects are scams as the scam projects often even look better than the legit ones. What we can do is to pass information around when we come across scam projects to prevent others from falling for them.