In WA State, funding of public schools is based upon enrollment. Each student enrolled full time (FTE) is worth $13,123.71 to the school district where the child is enrolled.
If the personal/philosophical exemption is removed and students currently using them withdraw from their district schools to homeschool, then those dollars assigned to them also leave the district.
Of the school required vaccines, three infections have been in the news as being related to “outbreaks.”
Whooping cough (pertussis): outbreaks occurring in and among fully-vaccinated students.
Mumps: outbreaks occurring in and among fully-vaccinated students (and military personnel on a ship stuck at sea.)
Measles: in-breaks are occasionally occurring in small cultural communities (no public-location spreading), and in mixed groups of fully or partially vaccinated and vaccine-free individuals. Even with 100% vaccination rates of school children, fully-vaccinated but measles-susceptible students, staff, faculty, and parents will always be present because of non-responders (primary failure) and waning (secondary failure). Surveillance, notification, and exclusion of measles-susceptible individuals at times of exposure (regardless of vaccination status) are safe and reliable public health measures that prevent the spread of infection.