Its a very valid point craft, a strong reason not to introduce compulsory vaccinations, and one i personally dont have an answer for :)
Obviously, before compulsory vaccinations were to be introduced, some system would need to be in place to take account of the educational needs of those children whose parents/guardian refused the vaccination.
It would be useful to know what measures are used in the US, Australia, Spain etc in these curcumstances.
It all comes back, as it often does, to the question of whether the health needs of the many outweigh the freedoms of the (assumed) few for this one particular issue.
Uptake rates as low as 16-25% in some areas of the country, and a stalled national rate of only 85% ( when for herd immunity we need 95%) require dramatic action IMO.