Banning the use of decentralized cryptocurrencies and banning initial coin offerings are 2 different subjects. SEC is saying that it's trying to prevent fund raising (that can be scams) that profit centralized companies. Banning something decentralized on the other hand is next to impossible.
It is not possible to ban decentralized companies but it is still possible to forbid its people to invest, such as the US which enforces KYC policies on ICO companies that want to reach US citizens, this is an effort to avoid scams. Fundraising in my opinion is still legitimate in the US, as long as according to local government regulations and policies, maybe only the US that applies it for now, because they also see it as a business to make money from taxes.