Ladies .... Ladies,
You're both pretty.
What I mean by that is FFXIV needs both Horizontal Progression AND Vertical Progression. Arguing that one is better than the other ... or that we should have one and not the other is like arguing that Mothers are better parents than Fathers ... or all Yang is better than all Yin.
I believe that is somewhat of a mischaracterization of what Horizontal Progression actually is. Horizontal Progression is not repeating the same content over and over again. That's Replayability.
Horizontal Progression is experiencing new content, items, and abilities, but at the same level of power as other content, items and abilities. The new Jobs System is perfect example of Horizontal Progression. Jobs will not make players empirically more powerful ... just more specialized.
I think we may have lost sight of the main topic of this thread which was about the rate at which the cap on Vertical Progression should be raised.
@AuctionGirl: I respect your opinion, but it seems from what you've told us about yourself in your posts that you can burn through content approximately twice as fast as the average hardcore player. Nothing wrong with that at all. But what you consider to be 3 months of playable content would take most of us 6 months to play through. In that light, I can see why you would advocate raising the level cap every 6 months, instead of every year or two.
But, raising the level cap every 6 months is so fast that it actually would disincentivize (yeah ... totally not a word) any Horizontal Progression content that FFXIV may contain. And we need both Horizontal and Vertical Progression content for this game to be fully a success.