No, removing Terri's feeding tube under the sketchy circumstances which surround this case, would only cause a backlash against any laws protecting the right to die -- and any serious right to die organization understands that.
Even now, the backlash would probably be greater if she recovers than if she is killed. Were it not for the recent publicity, that would certainly be the case: had she been killed, there would have been little backlash as few people would have known the truth.