It does not. It would make zero sense for so many people to expend so much effort to kill one woman unless it were part of some larger plot. I don't know whether the intended size of the victim pool numbers in the hundreds, thousands, or millions, but it's not just Terri--not by a long shot.
Although I do not doubt that Terri was substantially brain damaged, the legal mechanisms in place don't really require that. Any ward whom a guardian could pump full of drugs could be rendered 'PVS' and have some phony 'wishes' attributed to them to justify their murder. A "friendly" ME would be required to help justify the PVS claims post-mortem, but if outside observers can be blocked that shouldn't be a problem.
There have already been a number of exposés of cases where people have been declared incompetant and been robbed by 'gaurdians'. Mix that in with the ability for guardians to kill off their wards, and things start to look incredibly scary. Of course some people will be protected by the state. But others...
I don't believe this country is likely to crank up its death machinery to the level achieved in Nazi Germany. But since murder can be committed in broad daylight, I'd say we're much too close for comfort.
Not even that. It could be attributed to "unknown causes." PVS (or so called PVS) doesn't require visible brain damage.
Hot steel on target.
There have been some very close calls like Robert Wendland, who woke up from a coma to an aware, if mentally retarded, state and was almost offed by the courts at his wife's request, and horrifying tales like Marjorie Nighbert, who asked for food in vain after people thought she had wanted to be starved.
I would say that nobody who is aware enough to express interest in food and drink should be starved if he or she expresses such interest. "Competent" or not.