Apple included that only to test the waters and possibly later revoke the "analog hole".
If they were really being "courageous" about removing the headphone jack, they would have shipped it without the adapter and not made one available.
The people who think that just because they included an adapter, there won't be DRM, need to remember that from now on any service played on an iphone can decide whether or not to enable analog output, or even have a different output over analog. Cue the services that have decided not to work on analog, and paid ad-free audio.
You'd have to be very naive to not be worried about this in my opinion. calinet6 wrote a great comment about it in the comments here.
