Too bad they're expensive. Interestingly they're $275 here in .se, but listed as $399 on the US page.

Kinda? Apple owns Beats so http://www.beatsbydre.com/headphones/browse-headphones/wirel...

Normal usage time is about 4 hours on the cheaper units I use, and that's just playback without any microphone use. Maybe longer on more expensive units, while they are new, but I doubt many would get you through a whole work day of continuous activity.

Also, pairing is still fiddly and would probably put off a lot of casual users. (Especially when you have a N-to-N mapping between devices and headphones.)

USB-C could still work if there are enough ports. While it's been great having a common standard for headphones across devices (partly thanks to the original iPhone not requiring a custom dongle), it does start to feel a bit of an anomaly in an era where everything is converging on the new USB standard(s).