If you think that the 60 seconds is too short, then either don't camp or bring extra people so that you can coordinate your AFK's such that you always have enough people active to answer the roll call. Everyone need not be present, just a minimum number of people (24 is proposed here, but I would also agree that it's a bit high. Perhaps stick with the current 15).
i.e. Bring 20 people to the zone so you can have up to 5 afk at any time and still hold your camp indefinitely.
This seems reasonable to me. Everyone has a chance to try for whatever camp(s) they want and there is a mechanism in place to keep your camp once it is yours, so the guilds with the most "talent and dedication" (read: unemployed and single with no other hobbies whatsoever
[You must be logged in to view images. Log in or Register.]) can still attempt to permacamp the whole world if they feel so inclined. They just might have to coordinate their AFK'ing a little better, but since they're so talented it shouldn't be an issue for them.