There is also the sick irony (no pun intended). The anti-vaxers are preventing a phase out of a vaccine by their actions. If measles got nationally eradicated or better yet internationally (a slow laborious process sadly) - it would mean fewer vaccines because it did its job perfectly.
The Measles vaccine is also a proxy for other behavior. Minimally, in the US, folks that aren't innoculated for measles probably aren't innoculated for mumps or rubella (as MMR is one vaccine), or other important vaccines altogether.
[1] https://web.archive.org/web/20161023051702/https://www.cdc.g...