The jack will be around, but not used on mobile phones.
Thing is, it's not really Apples to Oranges unless you take the perspective you're taking. They're just standards that are assumed and included in everything that have now been removed - that's Apples to Apples. If you need a better analogy, look at the new Macbook with only a USB-C port.
Your assumption that this is going to be normal when I've seen this happen with TONS of headphones in the past, to the point that some headphones aren't compatible between Apple and Android manufacturer headphone jacks is ridiculous.
Icono, there has been a great disturbance in the Force. It's no coincidence that Apple chose storm trooper white for the new Air Pods and Darth Vader black for the special color for the iPhone 7. Prepare my friend.