I recently heard a doctor mention that cervical cancer typically crops up around age 40. As a result, a study like this is a bit premature. It's not bad news, of course, but it's also not exactly good news.
The lifetime risk of ever getting cervical cancer is about 1%. So, $30,000 per prevention if you just count the girls, or $60k if you vaccinate the boys as well.
A policy simply doing -some- good is not sufficient justification given a finite amount of resources to implement it. You need to compare policies against the alternative uses of the resources.
Neither is the fact that "lives will be saved" a sufficient justification. You need to compare that against the lives saved with the alternative policy options available with the given resources.
In Québec they did the vaccination to all the kids at 12yo, boys and girls.