So this idea struck me when I woke up this morning. I also shared it with my linkshell members and they said they would be very interested in something like this.
Basically this would be upgrading your weapon from the original AF set. You would upgrade it through a process, not sure what that would be yet, and eventually get it to a point where it's quite "beefy."
Also though at the same time as upgrading these weapons for 99, the storyline of each job would continue and also bring closure to some of the jobs that could really use it, for example summoner.
Sorry that more thought hasn't gone into the idea, but lets hear what you guys have to say about it and the possibility of implementing something like this for the new level cap!