That's a pretty insensitive point of view. I hope you live long enough to be able to make this choice.
That depends. I have known some where they can't do anything so what is the point. However I know many who are no longer able to walk well but they can still do most of their hobbies and so overall still enjoy life.
There's no point to living if you're in a wheelchair? If you get around with a walker?
I mean, of course that up to each individual to decide, my comment is my opinion only. For me, it doesn't seem like it would be much of a life.