ARK Investment Management’s founder-CEO Cathie Wood on Tuesday shared her insights on the future of cryptocurrency ETFs. What Happened: During an interview with The Wall Street Journal’s “Take On the Week” podcast, Wood predicted that the Securities and Exchange Commission (SEC) would likely approve spot exchange-traded funds holding only Bitcoin (CRYPTO: BTC) and Ethereum (CRYPTO: ETH). “We’d be surprised to see anything but bitcoin and ether being approved by the SEC,” Wood stated. ARK has joined forces with crypto asset manager 21Shares, aiming to launch one of the first U.S.-based ETFs hol…