What made the exploit so noticeable was the fact that everyone could see when you purchased an item. If a new exploit was found without the text that hovered above your head, then it would take somewhat longer to notice. In fact, it wouldn't blow up nearly as much because most people wouldn't know you were spawning items in the first place.
I have the feeling a new exploit will rise, maybe even an easier duping method. But those will both take a while.