I had an item on my wishlist which had been out of stock for over a year before it was discontinued. I've got a couple now that have reached the 6 month mark so I don't hold out much hope they'll be coming back. What about you?
I waited several months for the VixSkin Tex. It seemed like it was never going to come back.
I learned to set alerts and try to grab things quickly if or when they do come back in stock. Unfortunately, I have found that if an item is out of stock for an extended period, then it likely won't be coming back.