Seems like that would just be the same content with different rules though. I mean, why even change it to begin with? The current model is effective and good and provides a stable core of gameplay. I don't think changing that is a good idea. Maybe tweaking it a little (I am so sick of 450 weekly tomestone cap), but beyond that, I don't think it should be overtly altered.

I'm not against different kinds of raids/dungeons being added, or game modes like PvE and PvP and Treasure Maps. I remember talk about jobs that were not meant for dungeons/raids stemming from a misinterpretation of a comment about Blue Mage, and I don't think that's an entirely bad idea either. Imagine an Illusionist Job where you could go around collecting illusions of mobs.