The problem stems from the fact that there is no specialization in this game, and the economy will only get wrecked further the more time passes since release. Since everyone can level every job and craft (instead of being forced to pick one or two crafts to specialize in), as more and more people cap all crafts and enter the market, prices will be depressed even further. Once the amount of new players entering the economy slows to a trickle the problem will be exacerbated even further; this is already happening.

It's a recipe for failure.