The headphone jack was already destined to be replaced by USB type-c on many (not all) portable devices. Apple's move may change the time line, but does not change this fact.
"ports older than USB" meant serial and, later, ethernet.
My new-issue Dell work laptop lacks an optical drive and Ethernet. My dad just bought an even beefier Dell laptop and the first thing he asked was "where's the DVD drive?" Dell offered to send him a free external USB optical drive, but told him that internal optical drives were simply not an option on that make of laptop.
The question is, who is going to win: the legion of teenagers and young adults who listen to audio via the headphone jack, or device makers?
(It's the legion.)
If you had a replacement that was better - cheaper, less of an annoyance than $5 headphones plugged into a cheap phone - then you might win. But the proposed replacement is superexpensive, battery-powered wireless headphones. When the no-strain-relief Apple cables break, probably within weeks, you're supposed to buy another superexpensive set. That's not going anywhere with the horde of teenagers. It's a non-starter.
Or do like I would do, which is buy an Android phone. I mean they only have 88% market share, how long will _they_ be around?