Not immediately, no. Steam's effective because a massive wave of refunds has an immediate effect, after the game has already been sold.PlayStation fans have no way to affect PlayStation/Sony financially?
You can cancel your Plus, not get their next game but there's nothing you can do now. They already have your Plus money and by the time their next game comes out, it's not as effective as doing it right now, when all drama's happening, as it sends a clear message.