Suggestions, we can do that.

Crafted gear that is on par with darklight.
Crafted gear that is almost, but not quite as good as the Allagan set.
More variety with regard to materia:
- increased healing potency
- increased enmity
- decreased enmity
- increased combo damage
- increased DoT effects
- maybe have some of these lower the auto attack damage or something else to balance them out.
- increased mp regen but decreased hp regen and vice versa

There's a whole host of ways they can add horizontal progression and more customization, especially with regard to crafted gear and materia.

Open world content:
- higher level mobs in certain areas that add threat, but have rare drops or rare gathering areas
- some kind of open world dungeons or explorable areas
- random treasure chests (they don't seem to have a problem handing out gear like halloween candy, so this shouldn't be a big deal)
- random treasure chests that drop crafting items
- bring back the visible harvesting and quarrying spots (off-hand tools for miner/botanist). I LOVED these in 1.0 and would switch classes any time I saw them to gather some stuff.
- chocobo caravans could come back in some form
- hamlet defense could come back in some form to involve DoL and DoH jobs since we don't seem to have any real use in the game as it is currently.
- battle regimen could make a comeback for FATE's, that would encourage group play, and successful skillchains (or whatever term you want to use) could give you rare drops of gear, minions, crafting materials, etc.

There's a whole HOST of crap they could do that are small things but would add much needed depth and versatility to the game.