You are not keeping to the facts of Terri's case. She was not at the end of life. She was deliberately murdered by the withholding of food and drink.
Here is a case of another who was in a similar predicament to Terri's, but in his case, a loving and supportive wife stood by her man...and yes...miracles do happen!
http://www.fosters.com/apps/pbcs.dll/article?AID=/20050523/NEWS40/50513042
I didn't assert ~anything~ about Terri being at the end of life.
That said, her being PVS at such a young age makes her case sadder, not more hopeful.