"Why would it stop them when neither Merck, their gyno, their GP, nor the state of Texas would make the ridiculous claim that they should stop getting pap smears because they are vaccinated against four kinds of HPV? "
Maybe because Merck is marketing this as a "Cervical Cancer Vaccine", not "a vaccine against certain types of cervical cancer caused by certain types of HPV..."
See the companies announcement for an example.
Headline
Merck Launches National Advertising Campaign for GARDASIL®, Merck's New Cervical Cancer Vaccine
Do you really think that everyone is going to read (and understand) the fine print about which strains are/aren't covered by this vaccine?
Fine Print
GARDASIL is the world's first and only vaccine indicated for the prevention of HPV types 16- and 18-related cervical cancer, cervical pre-cancers (CIN 2/3 and AIS), vulvar pre-cancers (VIN 2/3) and vaginal pre-cancers (VaIN 2/3) and for the prevention of genital warts and low-grade cervical lesions (CIN 1) caused by HPV types 6, 11, 16 and 18.