I disagree that this is comparable to when Apple removed things in the past.
When Apple removed the floppy drive, it was pretty much useless. 1.5mb of storage by 1998 was already laughably small - floppy disks was undeniably on their way out already and pretty much totally replaced by CDs. When Apple removed the CD/DVD drive from computers, those were also on their way out as streaming was taking over music and movies and USB drives were taking over file storage. The same could be said of when Apple got rid of the serial port, etc.
Further, Apple was not the first to make a smartphone without a physical keyboard, there were quite a lot already on the market - Apple was just the first to make it work very well.
The 3.5mm audio jack is not the same. It is not inadequate for the time and thus it is not on its way out and the replacements are not prevalent.
But you are saying that after years of hindsight. Your reaction that "this is different" is exactly what everyone else said when the dvd/cd drive was removed. This will drive the wireless headphone prices down once the market gets saturated because finally someone is forcing it to do so. I think this move will bring life back into a market that has been stale for many years.