I don't like doing point-by-points, but much of what you said is not correct:
> You're going to have to replace the equipment
Or I could just keep buying and using phones with aux ports, and all the equipment at home/friends/family will continue to work
> But the real advantage of aux sounds like the standardization to you - and that's mostly a question of simply making the jump
I already listed a number of places I use the aux port. The only thing I own that uses bluetooth is a Garmin watch. I see no reason to switch.
> Yes, you need to spend a little money (but much less than your other devices like phones/laptops/etc
Or I could keep using aux and not spend any money, and my laptop/phone/desktop/car/headphones will all continue to work together just fine.
> Even today, you'll be able to use your bluetooth headphones with essentially all phones and laptops regardless of brand
Not with my desktop, nor my home theatre, nor my in flight entertainment.
> If your desktop doesn't support bluetooth, a desktop dongle is just a few dollars and you can leave it in permanently.
Or, again, keep using aux and have great quality and no dropouts?
> Switching standards is annoying, but it's going to happen sometime; and at this point bluetooth is pervasive enough that it's pretty usable.
Every time I use bluetooth, it is slow (garmin watch) or it drops out (car audio in numerous vehicles, microsoft wireless mouse) or the music stutters (cars again) or the batteries die (friends I see with bluetooth earbuds). Bluetooth offers me zero improvement, numerous regressions. And yeah, standards may switch sometime. But I have family with knob-and-tube wiring still in use, I doubt aux cables are disappearing anytime soon.