Doesn't this just give the crazies more of a platform to bitch and moan about it? I just see this making them even more paranoid about it.
"Why is the government forcing us to vaccinate our kids now?! It's a conspiracy, asdfghjjllsfghjl!!"
Doesn't matter if they bitch and moan more, so long as it pushes more people to vaccinate.
Not all people who don't vaccinate do so out of disagreeing with vaccines. Many fail to get their children vaccinated because they can't be bothered, or don't have the time, or don't see the benefit.
If they lose money because of it though, that may be enough of an incentive to push those people to make sure their children are vaccinated.