unlike the FAUX Futures market with Bitcoin where NO actual bitcoin is involved and so does not effect the market in a supply and demand way , and ETF will actually hold bitcoin or litecoin in a custodial fund in quantities which could in fact reduce the supply in general and so increase the value. In the ETF the Crypto would not be TRADED back and forth by a day trader but would be held by a trust of some kind. If they do it like the make believe Futures it will do nothing,.