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.
This. Also, if you invest in a good/great set of headphones, they should last years. With Bluetooth, won't the standard change over the years causing them to become obsolete? Not to mention their batteries wearing out and having to keep them charged. Lightning is proprietary, so unless it is opened up for standardization it seems weird.

TV threads. There you'll find passionate arguments against 4K, against audio codecs newer than 1992's Dolby Digital, etc. Apparently "people" argue hardest for whatever Apple has for sale now or is likely to roll out soon. Yes, Apple themselves spin "think different" but that apparently means "when it jives with what Apple has for sale now or soon", not when people convey their aggravation at what can only appear to be a move in the name of proprietary-driven profit and/or "thinner."