There will be an improvement in audio support on Type-C USB connections which will decrease power demands, as USB Audio Device Class 3.0 specifications have just been announced.  When compared to the 3.5mm headphone jack, USB audio is a power hog which will shorten the amount of time your battery will last on a phone or other mobile device but it seems that the USB-IF have been working to overcome this issue.  Product manufacturers are looking forward to this as USB can be isolated from other internals far more effectively than the 3.5mm jack which would allow them to waterproof their devices. 

Hopefully the new compliance testing regime brought about after the consequences of using a bad cable to charge your laptop will ensure we do not have any related problems with audio devices.  The Register does remind us that Bluetooth 5 is yet to be commonly found on mobile devices and could offer yet another 3.5mm nail in the coffin.

"Hear that, children? That's the sound of another set of nails in the coffin of headphone jacks in mobile devices."

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