I have never seen the CD as a direct replacement for the floppy disk. They both had very different use cases. I am not going to burn a presentation to a CD and pass it around, for one. USB would only come later.
The removal of the headphone jack will usher in a new generation of Bluetooth headphones and help spur their adoption. If you look at what Apple has done with the airpods, it's clearly Gen1 of a new wave of wearables designed to bring Siri to your ears (and subsequently other sensors and trackers).
Either way - my stance is this. What's done is done. The headphone jack is gone from the iPhone and it is never coming back, however much people whine. The people who think Apple is doing this simply to sell more headphones and adaptors for a quick buck clearly don't know Apple, what Apple stands for, nor do they understand how Apple does business.
You can either continue to complain and hold out for as long as you can, switch to a competing platform, or you can embrace the future as prophesied by Apple. It will make no difference either way.
Wired mechanical keyboards are still superior to Bluetooth keyboards, so I don't see wireless headphones coming close to wired anytime soon.
If Apple gets enough backlash they'll back off on the stupid proprietary headset ports like Microsoft and Nintendo did before them. If not, then I'm sure someone will sell me a detachable cable by the time I need to replace my 6S so it's not the end of the world. I'm honestly more upset by the touch pad replacing the home button.
...If Apple truly wants to get on the all wireless train, then they should have probably started with wireless charging. That's actually something I want and it's been available on Android for years. Hell, even my toothbrush has wireless charging for crying out loud.
Yes, the floppy was around for 100 years before it was replaced.
I didn't morn the loss of the floppy as I used it very rarely. For my use case, the headphone jack is used on a daily basis in various settings.
I use my headphones 8+ hours a day every day at work. It's primarily hooked up to the computer to save on data, but I use my iPhone quite a lot with it too. I've also had the same pair for about 8 years and they're still rock solid.