You are going into one of my favorite concerns of attempting to keep the cost of health care affordable: just because we might/can save someone does the cost justify the attempt?
Any serious attempt to rein in runaway healthcare cost must somehow weight the cost of the treatment versus the benefit.
Does it make sense to spend hundreds of thousands to millions of dollars on someone who was severely injured or would that money be better spend for well baby (or other such things)? If its your own money, fine, spend what you want, but if its "societies" money, is one person worth it?
May sound harsh, but all I am pointing out is basic Economics 101, "allocation of scare resources that have alternate uses"