Making vaccines mandatory is a bad idea. Obviously it's probably one of the most intrusive acts ever. What can be more intrusive than being required to get a needle in your arm, even against your will?
And second, who do you try to motivate with this? People who are afraid of the vaccine, will rush to doctors to get an exemption or fuel a black market for avoidance strategies. Those who oppose this for political reasons will consider it proof for their nightmares.
So what's the goal?
Many vaccine-hesitant people probably pay taxes and drive while carrying a driver's license and having car insurance.