I don't believe the headphone jack was removed simply to sell AirPods. The removal of the headphone jack is a non-issue. They give you lightning headphones with the iPhone, as well as a tiny little adapter that is far less bulky than many headphone cables I've seen. There are plenty of Bluetooth headphone options out there. Apple plans to offer a premium option with AirPods, but they are hardly the reason the jack was removed.
Sometimes things take longer than planned. It's not the end of the world.
They're certainly not doing it for charity, and there's no other reason to remove something functional for something that... doesn't work yet. The alternative solutions (lighting headphones) are just to sugarcoat the medicine; they're bulky solutions (can't even use the headphones on the new MBP!).