I trade my Bitcoin and Ether on the Gemini platform owned by the Winklevosses. Being a resident of New York, more and more companies are not joining the regulations that we have here (For example, I cannot have an account on Poloniex).
I think getting Bitcoin and all Crypto into mainstream ease of use would be ideal for its further acceptance and growth. An ETF will definitely expedite further growth. These are just my opinions.
-bigedude