I agree if they all closed the ER’s they would be able to show that they too have power.
They would also demonstrate power by simply ignoring the law and keeping the hospitals open for legitimate services. In other words, telling the legislature, “MAKE US!”
There is a great lesson to be learned here in appropriate civil disobedience. When the law is immoral, there is no longer an obligation to follow said law. Closing the doors without a fight means the culture of death has power over the moral right to refuse following laws that are morally unsupportable.