We will slowly see more and more ETFs in the Crypto space. Most will start trading companies investing in BTC and mining BTC (i.e. avoid direct exposure to get around regulation issues).
This is happening in Australia with Betashares launching their CRYPT ETF (https://www.betashares.com.au/news/betashares-crypto-innovators-etf-cryp-coming-soon-to-the-asx/).
Once there is direct exposure to BTC we will see a significant price jump as industry funds can begin to get involved.
ETF companies are seeing the interest and money to be made. Every ETF survey I've been sent over the past 12 months has asked about my interesting in investing in a range of new "trends" e.g. Ethical investing, etc. Crypto Currency has always been listed.
Personally I prefer to hold directly as there's no fees (bar purchase) but I can see why there is a need for ETFs in the crypto space.
Remember - we're still early in the adoption phase!