This is a really dumb conclusion to draw, that the ONLY reason more people played in the past was because they liked things like taking 9-12 months to level a job, or waiting 3 hours to have a chance to claim a Notorious Monster, or liked needing a full alliance to do anything, or liked that endgame linkshells were basically pyramid schemes where the earliest joiners got the best items while later joiners spent countless hours grinding or camping an NM for a hope at the scraps.
As Analenhem said, there are a host of reasons people likely left: less time due to real life commitments, simple boredom, being drawn to another game. I've known dozens of people who quit, and not a one of them did so because Abyssea or Adoulin era content was too easy. You're simply attributing your preferences to large masses of people to support your thesis.
