Our church has been asking the same question since we starting using F1 - over a year. We have not put out a directory - via pdf format since we went to F1. They keep telling me enough people have to "praise" the idea for it to move up the list.
Like you my concern isn't so much for a printed directory as the ability in F1 to see the family. Many times that is the only way we have of know which parents and children belong together.
It amazes me that after 3 years people have not complained enough about not having the ability to have a family picture in the Household slot. Why even have the picture there when you can't use it effectively.