[One] reading would be few inhabitants of the super city were aware of the opt-in programme. Either way, anecdotal evidence suggests few will miss the door stop directory.
One person who tried to opt-in to the White Pages told NBR it wasn't easy. She phoned Yellow Pages Group, but was told the opt-in process had to be onliine. She found the online form asked a number of what she considered intrusive questions, including asking her to supply her email.
Of course requiring people to apply for the directory on-line excludes the people who don't have the Internet, and I would guess that the majority of the people who would use the printed White Pages would be people who don't have easy access to the Internet.