There's a basic flaw with this argument and with the "Would you want to be in Terri's condition for x years?" argument.
You are describing what Terri looks like to a healthy person observing her. You are not describing what things look like to Terri. And it's Terri's wishes, not the observers wishes, we are told we must consider.
There are two ways, at any given moment that Terri can "look at" things.
If Terri can think and feel, then give her to her parents who want to give her therapy.
Michael washed his hands of Terri long ago.
"if Terri feels and thinks nothing, then she has no wish to die. Why would it hurt her to keep her alive?"
Why do they cover your privates after you die? You'll never know the difference.