Yeah, that's interesting. Unfortunately, you need to crack open the phone and solder some wires together, so it's not terribly accessible to the average iPhone owner.
My least favorite aspect of the iPhone is the lock-in. It's indicative of the broken, anti-competitive cell phone space. Congress has been taking a closer look at this due to the furor over Apple's 5 year exclusive with AT&T, so hopefully some progress will come of that.
At the very least, efforts like this keep visibility on the lock-in debate.