July 12, 2018
An SEC approved Bitcoin ETF is a smart move at this time. I think Ethereum can be treated in a similar manner, but may truly become more than just a security (think world computer that depends on all decentralized contributing parts [including their coin]).
In the future, it would be smart to implement a minimum required time without a blockchain hack (does not include exchanges or wallets) before approving the security for trading in US markets. Bitcoin and Ethereum have proven themselves as secure and their governance will continue to value security above all else. 'Bitcoin Cash' however (a hard-fork of Bitcoin) is too young to be insured against losses.
My 2cents,
Robert Durkin