If ETFs are not launched in the US, then they will be launched in another country. This will lead to growth in any case. Most likely this will happen before the end of 2018
I believe that it was the possible scenario with the adoption of ETF Bitcoin that was a positive factor for the purchase of Bitcoin by many investors, which led to an increase in the price of Bitcoin. There have already been several attempts by the SEC to accept ETF Bitcoin, but past attempts were not successful, there is now much more chance that the SEC will take ETF and this will open up new opportunities for large investors and the price of Bitcoin will soar to new price records.