Not at all. We require school children to undergo medical procedures before they may participate in city-funded education. The tone of alarm is unwarranted. This is not a slippery slope situation.
The paranoia is a bit too late. Emergency powers were established by Congress a century ago, and at least 60 national emergencies have been declared since. In New York State, a state of emergency declaration permits the governor to direct local officials and state agencies, and to suspend state and local law or regulation to facilitate disaster response efforts. If there ever was a slippery slope, it has long since been descended many times.