We're already at this stage - we have many life-extending (there's no life saving, only extending it for smaller or larger amounts) treatments and procedures, and the amount is growing. For pretty much every patient who dies currently we could extend their life a bit more (not they'd always want that, mind you) if we put in more resources in that patient.
It's tautologically clear that it's not possible to do everything for everyone, i.e. a community 100% composed of doctors and nurses wouldn't be able to provide all the possible life-extending things (especially late in life/close to death) to everyone of themselves. So one way or another we need a process to decide where we stop, i.e. what life-extending things will not be provided to which people.
Of course, there's a major practical difference between in a process that takes/costs one day of labor and extends life expectancy by a year, and a process that takes/costs a year of labor and extends life expectancy by a day - but there's no conceptual difference, and we have options all along that scale to find where the tradeoff starts/stops making sense.
It's tautologically clear that it's not possible to do everything for everyone, i.e. a community 100% composed of doctors and nurses wouldn't be able to provide all the possible life-extending things (especially late in life/close to death) to everyone of themselves. So one way or another we need a process to decide where we stop, i.e. what life-extending things will not be provided to which people.
Of course, there's a major practical difference between in a process that takes/costs one day of labor and extends life expectancy by a year, and a process that takes/costs a year of labor and extends life expectancy by a day - but there's no conceptual difference, and we have options all along that scale to find where the tradeoff starts/stops making sense.