So much fallacious reasoning, so little time...
(a) We're talking about the (hypothetical, but highly plausible in light of other recent Apple form-over-function decisions) removal of the jack from the iPad, not the iPhone. More specifically, the iPad Pro, which is promoted as a laptop alternative to users who want to do a bit more than watch Celebrity Love Island on the train. Do you think Apple would still be actively developing GarageBand or iMovie for iOS if nobody used them? Yet people have pointed out here time and time again that the lag on all wireless headphones makes them useless for such things.
(b) Just because you see people using AirPods on the train doesn't mean that they never use the jack. I'd wager that a lot of 3.5mm-supporters here
also have wireless headphones for when they want tunes while walking around. OK, maybe we've got a few golden-eared audiophiles here who think they can tell the difference between analog and digital while listening to a MP3 on a train, but most of the reasoned criticism has been about lag, the inability to charge without a dongle or the ability to use other Lightning devices at the same time. Not usually an issue on the commute home.
(c) Maybe if it keeps being said it will eventually penetrate:
Having a 3.5mm Jack doesn't stop you using Bluetooth headphones. There's no reason to believe that Airpods wouldn't have been a huge success even if the iP7 had included an audio jack. Personally, I owned bluetooth headphones before the Airpods or iP7 existed (my current pair work as wired headphones too). They're good for what they're good at - but sometimes you need the wire.
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On another note:
View attachment 773737
https://www.apple.com/mac/
Oooh, look, wired headphones! (OK, its about Mac, but if they come for the iPad jack today...)