Imagine how much pub android would get if moto/htc/samsung/verizon/tmobile/at&t/sprint allowed you to trade in your ip4 for a new android phone. That would also strike deep into the heart of apple and with all the iphone 4's problems there would be plenty of people making the jump. Even my year old droid 1 is much better than a silly ip4. And it wouldn't be hard to resell the iphones to offset any cost to them. I think this would be a fantastic idea.