I have a separate mp3 player already, but I use the headphone jack to watch youtube videos on the phone.
I'm waiting a bit to upgrade my phone. I've always had a Samsung up until now, but I won't be buying one without a headphone jack. Hopefully they'll come to their senses. Bluetooth is a painful joke.
They took my removeable battery but they will never take my headphone jack! Oops, I mean freedom!