It doesn't have to be, no, but I still think AF have passed that point.
Deadpool's first appearance was 1991 and he came to "cult-hood" around 2008, 17 years later, after 2 minis and 2 ongoings.
AF's first appearance was 1979 and 35 years later have had 3 ongoings and 2 minis and still haven't found that niche; Vol.1 issues can still be picked up in 50c bins.
Short of a film, or a major, major creative team taking on the team, I don't think back issues will become a priority.