Agreed, I welcome additional space to store items, but once you reach the 100+ count scrolling through is going to be a PITA. I would rather see something separate like tabs:

Player:
Weapons/Armor: xxx/100
Crafting Supplies: xxx/100
Crystals: xx/18
Currency: xx/??
Materia: xx/50
Bazaar: xx/??
Loot: xx/??

Housing:
General Storage: xxx/100 (Must enter house to access)
Chocobo: xx/50 (Can call chocobo to access this on the field)
Retainer: xxx/100 (Can call in town or in house with bell to access)

Total space: 350 slots for any given type (Crafting or battle related) at any given time.

Make them all different tabs, give quests to increase those separate bags like in XI to give additional content. Like I said this won't remove any spaces from the