Uh, Harry, exactly how uninformed are you on Terri's condition? There are NO respirators. There are NO machines used to keep her alive. The artificial means you are talking about are food and water - just that and nothing more. There are even doctors that say she could have fed herself if she was given the proper therapy over the years. Judge Greer is finally making Schiavo answer for that.
Is this your premise: "Well, Mommy can't feed herself anymore due to her crippling arthritis, pull the plug?" Because Terri's case is a lot closer to that scenario than someone hooked up to a bunch of machines.
I really don't see how you can logically compare the Terri Schiavo situation to someone with crippling athritis. While both patients require someone else to care for them, only one is aware of their surroundings and has the ability to understand and communicate.