My thought upon reading this story was, "Oh, thank God!!"
I had been hoping there was a definite end that science could not trick. I was beginning to fear that the medical community was going to try to force any level of existence to continue without regard to quality. Death is a part of life. I'd rather live with that than trying to force a 100 year old body to keep it's heart beating just because some family member doesn't know how to cope any other way.
That is a view and a choice that I can respect, but why should you cheer the possibility that no one be able to choose any other way? That those who want more life be denied it?
Like a lot of the elderly people you mention, I think I too would choose death over prolonged suffering, helplessness, and a lack of ability to accomplish much more than running the bills up for my family. But I don't think I would choose death until that was all I had to look forward to, and I would be happy for any medical advancement that pushes that inevitable time back and that preserves health into those latter years.
And if the generation after me is able to live forever, I will not begrudge them that just because it was too late for me. (Okay, maybe I'll be a tad jealous.) However, I'd oppose any efforts to stop it with what's left of my life.