People in this position can be comfortably kept alive for a long time and enjoy their last years with their most loved, and the most loved can have more time to just be with the love of their life.
But the default position now is to starve people to death if they can’t swallow or walk or communicate normally and a health crisis occurs.
It depends if he’s still conscious. I personally don’t want to spend my last days in a hospital. Nor do I want my children spending 10 years visiting me when I’m not conscious and am drooling and crapping on myself.