Far as it goes- people do tend to think in terms of "I must go do GoV in the three narrow areas in order to level up!".
Then they fail to realize that from 1-24, Dangruf Wadi is easy to solo, 24-35 Maze of Shak, 36-49 Delfkutt's, and so on...you don't HAVE to be in those three GoV zones to do things exp-wise. They're just the spots where people found it easiest to AFK-leech off groups wrecking the place, and honestly, demolishing a steady stream of weak EP's isn't tough to do, even solo. /DNC it and you're self-sufficient for the whole thing. People gravitate towards easymode.
The big flaw was when FFXI gave up on making the journey worth something, versus jumping to 99 and rendering expansions the sole method of entertainment.