I carry gear for 4 jobs, a tool for every craft, food, 5 stacks of dark matter and the AF armor for all those jobs and I'm @116 slots so if I placed the AFs in storage, and put away some of the gear I don't always use I'll be within 100 slots.
I don't think that would be possible while carrying gear for all 7 jobs, nor do I think anybody should be doing that to begin with. Just because you can change to anything on the spot doesn't mean that you should. in FFXI we carried gear for 2-3 jobs on us and left the rest at the Mog House since we had to go back there to change jobs anyway so there was no need to carry all that junk on us. (inventory was like 80 slots max)
I guess in ARR with the client lag removed, gear sets implemented (gear in sets don't take inventory slots) and the extra characters/retainers to store stuff on, living with 100 slots won't be an issue.
Also we can't say that SE wont expand our inventory space via quests or charging us for space which was the whole idea behind the retainer gimmick.
