Of course, you’re also paying Apple in perpetuity! And this monthly bill is only going to go up as they bake in AppleCare (which they do), theft protection (new this year!), and eventually all sorts of other goodies: iCloud storage, Apple Music, Apple Television (the service, not the box), etc.
I agree with the subscription/recurring revenue thesis, but one additional factor you should add is this sustainability pledge Apple made during the launch event. This is the smoking gun. Their current business model cannot survive: