Since this has evolved into a "make things harder/more challenging" topic, thought I'd add my own requests:

1. Perma-death. Get rid of this confounded 'ressurection' thing every time you die. A Real MMO should penalize you properly for messing up

2. If that's a no-go because you've gotten used to these casual MMOs, then penalize deaths by removing XP and/or levels. Level 59 BLM when you die? Say hello to level 55 BLM.

3. Remove Aetherytes. Bam. And force a cut-scene for every air-ship trip, or no, even better ... I figure it takes a couple of days to travel between the 3 major cities ... once you start travel, you log off and wait for an email indicating you can go back to playing.

4. Magic abilities should require you to select the spells you want to cast and memorize them overnight for use the next day. You're limited in the number of spells you can memorize at a particular level, and once you cast them all you're done playing for the day.