This family should have the right to determine at which time resuscitation measures are stopped.
But
OHIP as a public payer system should also  be able to set utilization standards. In this situation where treatment has been proven to be unable to restore meaningful function in other words, the treatment is futile, OHIP should be able to defund the service.
I am confident the day after the $10,000 /day ICU bills are no longer paid by the state, the family will  reconsider their religious obligations to keep this man in the ICU unresponsive for thinnest decade.