I can only guess that is because of Nost? I know AV on the final patch before TBC was just an afk farm fest as people tried to grind out honor for the pvp weapons heading into TBC. In early Vanilla when AV is released there were some amazing battles that took place there on my server. The one I remember the most is one that took over 2 days to complete. I did AV most of the day, went to sleep and woke back up and joined the same AV. That was crazy. Not that it would likely happen again in whatever type of Legacy that was to come out but it seems like they want some sort of Nost version since it was on the final patch, that would likely eliminate those types of games from ever happening.