Implementing this needs a central authority. There are lots of factors to consider but if government will step in, those problem regarding who will conduct the KYC for ICO projec developer will be solved. Without government intervention, there will be lots of KYC verifying company to sprout taking advantage of this new profitable venture. Another problem is how credible are those company that will conduct KYC.
I think those 3rd party KYC providers will not risk their business integrity or possibly loose their business if they deliberately falsify identity records of supposed to be scammers because they could also be held liable if they are found to have been conniving with those people especially if huge sums of money are involved.