It will never be acceptable ethically for the state to say the ventilator must be turned off.
What IS ethically acceptable  for the state to say. We have done the financial and societal benefit math on this and we are not paying for this service.
In the reference case being discussed, the family would have been presented with a single $5,000 days bill for ICU care. And they would have been able to reconsider their spiritual guidances recommendation and reversed the decision to instead turn the ventilator off. It would have happened in one day.
Provincial health care plans currently  have many services delisted, and it would not require any new law or policy to implement this sort of approach.