Inflation is rampant on RO so I think its about time we pick a new currency. (like diablo2 did with the SOJ)

Pros:
More managable currency as opposed to billions upon billions of zeny.
Zeny would be used to buy this item initially thus the rich will still be rich.
Botters would be forced to one map in order to get this item (then GMs will have an easy job of hunting once zeny becomes useless)
Possibility of removing bots altogether if the item chosen is not bottable.

Cons:
Low-grade items would result in trade situations of equal value instead of zeny.
Harder to vend your junk (unless the devs catch on and give vending options for the item!)

Now to think of the item, possible candidates:

A new world card (to avoid pre-dipping of previous inventory).
OCAs (encourage pvp!)
God Item Parts (encourage pvp!)