3.5 mm jack is the price of evolution. Yes, we want lighter, thinner phones. Eventually even Samsung gets it, because bendable is really just very thin display. Apple gets it too and wants to move there, but Samsung is right, and Apple is wrong? Huh.
Just like the CD drive or PS2 connector. They were ubiquitous, easy to use, well known, whats else?
Did they survive? No. They were replaced by faster, better connectors and technologies. Just because you have some old headphones with 3.5 mm jack, doesn't mean that new connectors like Lightning should not be offered. If you don't like it, you may not buy iPhone 7. No one forces it. You may have an easy and elegant adaptor, you don't like it - don't buy.