ETF's are nothing more than price trackers, really. It makes no difference that the market becomes stable or not. It's just that the SEC needs to stop acting like a complete hypocrite and allow this market to develop naturally. Everything tethering the price of Bitcoin or other coins has a certain level of risk involved, nothing will be able to change that in the coming years. If volatility was a real concern, the future markets wouldn't even be allowed to operate. On top of that, platforms such as CBOE and CME have various security triggers in place to halt the market at the time Bitcoin's swings become too wild -- on the first day CBOE halted trading several times.