WHY did he say no? THAT is the rest of the story...
Having worked with doctors, they will tell you that people always want to know the "removal" options. I know one oncologist who "recommends" surgery for 93 year old cancer patients in comas, just because that is "standard treatment protocol" for tumors, NOT because it is appropriate for the case. Doctors are required by courts (read: malpractice suits) to recommend standard treatments, whether or not it is case-specifically appropriate.
Using the example of the oncologist, if she has a 93 year old coma patient who has a tumour, and she recommends to the family that the patient NOT be operated on, IF that patient dies of something even remotely related to the tumour, the family can come back and sue her for not recommending standard treatment. AND they would probably win, whether or not the treatment was appropriate. In addition, they can sue her if she recommends standard treatment, it is followed, and the patient dies on the operating table OR post-surgically.
Now, I realize that Mrs. Schiavo is not 93 years old. I also realize that she does not have cancer. I believe this is analogous though, as to the doctors' "recommendations." They are easily misinterpreted by family who see the case through the lenses of personal grief, hope and perhaps unreasonable expectations. Sometimes the doctors are forced to make "recommendations" that are not in the best interest of the patient, because there is no directly related precedent for treatment, and their hands are tied into following the most closely related protocol.
On a Schiavo related note... if her cerebral cortex has been largely replaced with cerebro-spinal fluid, what do you expect will happen when they drill a hole in her skull to remove the implants? Do you think the loss of the cerebro-spinal fluid will improve her condition? Keep in mind that the function of CS fluid is to protect the brain... even if she has very little brain left, it is still protecting it.