Our current vaccination rate for measles is not really adequate which allowed an introduced infection to spread a bit and even find a second epicenter due to travel. However, we do have a sufficient immunization rate that it died out fairly quickly. The empirical evidence proves that.
If you are correct, why isn't measles spreading in a big wave across the country right now? Most of the population has never had the measles.
It's not spreading all over because infected people from hot zones like the Philippines are not really doing a lot of traveling to the U.S., and, as I said, after onset of symptoms, people self-quarantine, and after an outbreak, people avoid other people they don't personally know, and avoid large gatherings of people where transmission is more likely.
Vaccination is not 100% effective, but strong border controls on people traveling from hot zones and strict quarantine rules are 100% effective.
Can't have an outbreak without a patient zero...