Okay, I thought of that world, and it's not the world we live in or we're gonna live in for... many years.
It will for sure go way slower if we think like you suggest we do.
Because that's how it will always be: until the end of time you will have to have a DAC feeding a preamp connected to the moving coils.
Doubt it, at some point we will move to not needing headphones at all since everything will be transmitted digitally to our brains. Might still need a DAC there though, who knows what we come up with.
I would choose the sane way, of course: a data port for connecting any fancy A/V device I can think of, including a multitrack, 16 channel, 24/192 audio interface and a regular jack for connecting my headphones to the on-board DAC, which provides sufficient quality for 99% of users (including those - probably a majority - that still have 128k MP3s around and don't notice the difference).
We are moving towards a one port for everything system, I dont really see the point in keeping the headphone jack as the only thing with a one use port while everything else moves to a one port solution. 99% of the users will not care if they use USB-C headphones or 3.5mm headphones once USB-C becomes the standard, and that will only happen if the 3.5mm goes. If you get rid of the 3.5mm you will be able to squeeze in an extra USB-C which is way more useful.
Note that there probably is an on-board DAC anyway, unless they do away with speakers entirely, so why not use it to drive your college kid's el cheapo headphones?
Of course there is most likely an on board DAC for the speakers so it is possible to use it for the 3.5mm but that will not get us forward.
The reason I cling to it is because it is the sensible arrangement![]()
If you want to recreate the past 50 years perhaps, not if you want to find a way forward.