I have Bluetooth in my car but out of convenience of quickly plugging in the jack, I would use the auxiliary connection instead more often. With Bluetooth, I'd have to go through a few steps to connect to it and it takes another 30 seconds. But completely eliminating the jack isn't necessary, Bluetooth and the jack should stay and be used according to preference instead of having no choice. I honestly don't see headphone jacks going away soon. I remember back in the day the HTC MyTouch 3G only had a USB mini jack, a converter was needed to plug in a headphone jack, very inconvenient and you can't plug in headphones while charging. Other phones had a 2.5mm jack and they had converters for 3.5mm. We'll be going back to converters again without headphone jacks.