Earlier quoted context omitted.
"The idea that this is simply a cheap cash-grab sounds like a conspiracy theory to me." Conspiracy theories are sometimes true. In this case, vendor lock-in is Apple's bread and butter, and it doesn't take any mental gymnastics at all to recognize that removing a standard and universal port without any actually good reason fits that pattern remarkably well.
1) it still allows standard 3.5mm headphone jacks to be used. 2) Bluetooth is a standard, and Apple isn't the only company that makes Bluetooth headphones.
Apple don’t support high quality Bluetooth audio standards except with the license of their own proprietary technology.