She isn't hooked up to "machines".
She is breathing all on her own. The only help she needs is a feeding tube. She might not even need that is she was given a chance to have therapy.

As to why her husband would want her gone, well, he has had two children with his mistress. He can't marry her and make them legal until Terri dies.

What next? Visit all the nursing homes and get rid of all people who have trouble taking care of themselves?

Just a couple of months ago, a lady here in Kansas came out of a coma she had been in for over 10 years. She knows her parents and can speak and is recovering.
Miracles DO happen.