We do not know the wishes. Terri is not a vegetable.
And you are wrong, Michael is in control of this game...
The best neurological experts in the world have found Terri in vegetative state. Even the controversial doctor retained by the Schindlers thinks that most of Terri's brain cortex is gone.
Although the physicians are not in complete agreement concerning the extent of Mrs. Schiavo's brain damage, they all agree that the brain scans show extensive permanent damage to her brain. The only debate between the doctors is whether she has a small amount of isolated living tissue in her cerebral cortex or whether she has no living tissue in her cerebral cortex.