. If you send messages regularly to iOS 5 users, you may be able to switch to a cheaper texting plan from your carrier. Assuming you send messages exclusively to iOS 5 users, you may one day be able to ditch a texting plan altogether.
The very fact that iOS5 knows you are sending a SMS to another iPhone and switch your message to data is already a huge innovative way of thinking. They are not abondonning SMS, but it’s there for texting your Mom and all your friends with a Xenon.