Not sure that replays is the cause for lack of content. People were really replaying A&B, not the alerts. Sure people will replay the AF alerts when they come out. But they wont replay them as much as they did for BIA and FAM because it set up for being able to do the raid. My guess is that AF will have the lowest DLC launch replay value right next to trigon. If anything replay badge sales and usage measure the amount of replayable content of each DLC, thus increasing or decreasing the DLCs value.