To expand on that notion, the player base has changed. Since Abyssea, we've realized we may not like working with large groups of people for the sake of bodies being present. People left. Circles got smaller. Content should reflect that. If the game were newer, it would be a little different. But facing facts, it's pushing 9 and a half years right now. The idea of a hive mentality of a HNMLS is kind of gone, because all the players who enjoyed that and made the game functional in that way are for the most part gone and have moved onto other things.
tl;dr Abyssea is still going to be where the bulk of people are unless the devs can come up with content that can make a bigger impact on people than Abyssea did.