My thoughts exactly, pre earnings volatility levels often give rise to 4 - 6 x the normal daily estimated move on many popular stocks so relying on volatility crush alone without consideration for the price move is a futile strategy.
A safer approach used by some, is to sell an unbalanced butterfly (i.e. a short butterfly) with a narrow gap in the profit zone ATM, despite having long vega, it at least offers protection provided the move is significant.