I'll be rather disappointed if they make us have 2 of the same gear. The whole rare/unique item is one thing, but what about your melded gear. I just made some +52 str felt bracers to use for MNK and WAR. I really don't want to have to make another set just to use for the other job.
So if they make it so you have to have duplicate items, I see myself having only 2 gear sets: 1 for lvl 50 DOH and 1 for lvl 50 DOL. Which I currently have macros for so gear sets will be pretty much useless.