How about remove the feeding tube but let the parents try to feed Terri orally? If they succeed, great. If not, too bad.
Is there any way in which that would have wrongfully harmed anyone?
That sounds like a logical response. If you are a parent, your natural impulse is to protect your child. Knowing that your son-in-law has already moved on, with another woman and children, isn't very reassuring. So of course, they will do everything they can. It was never proven this was her wishes. If in the end, as in this case, there was nothing they could do, so be it. At least it was proven who really cared.