A fork could definitely cause some temporary confusion, but wouldn't an ETF just be tracking the sum of the value of the forks? At some point they'd need to pic

A fork could definitely cause some temporary confusion, but wouldn't an ETF just be tracking the sum of the value of the forks? At some point they'd need to pick a side, but in the meantime they could just buy/sell equal amounts of the forked currencies. Once they do pick a side they could either sell the other side of the fork, or allow withdrawals (like Coinbase, etc did with ETC). As long as the rules are laid out ahead of time I'm not sure why the SEC would object.