I feel like that could backfire. The antivax movement would use it to try and kill off all compulsory vaccinations leading to a resurgence in otherwise rare diseases. ERs would hesitate to perform lifesaving operations without consent over fear of being sued later.
Then there is the question of who makes bodily autonomy decisions for children and people unable to make decisions for themselves. If parents, you could see an increase in religiously motivated mutilations. If the state…