I'm sure you won't agree, but yes, I believe there is. Why should a spouse or other loved one be forced to maintain a terminally ill patient, incurring all of the tremendous costs involved, if there is absolutely nothing that can be done to save the patient? (Assuming, of course, that the patient is ready and willing to die.)
And I also wonder how long hospitals and doctors would keep those patients alive if they could no longer receive any funds, either from the family or the insurance, but had to pay to keep those patients alive themselves? I would guess they would quickly lose about 95% of their "moral" objections to termination.