Oh it was Abyssea's fault, was it?
http://wiki.ffxiclopedia.org/wiki/Vision_of_Abyssea
As you can see, the subs were in sharp decline before the first Abyssea even hit. Where are you getting your numbers about post-Abyssea, pre-VNM (when the game started sucking again)? Because for every thread from HNM fanboys mad that they couldn't exploit people through pyramid-scheme shells anymore, there were people who had previously quit returning because they heard that:
1. There was no longer job discrimination, nor a need for manaburns or colibri burns, and
2. Small one-to-two party LSes could complete 99% of Abyssea content.
So tell me again how Abyssea "ruined" FFXI?