That's just it, you're either relegated to expensive battery-hungry Bluetooth headphones or stuck using some form of Lightning or USB-C adapter.
For iPhone users, this means that if you want to keep using your existing (and quite possibly expensive) headphones, you'll have to also get an external DAC.
USB-C, which is the emerging standard on Android phones, can theoretically use the phones own internal DAC, but you'd still need to fiddle about with an adapter.
In both cases you'd need yet another extra gizmo if you want to charge your phone while listening, as you're already using the charging port for that.
On top of that you have the normal Apple douchebaggery; instead of using an ubiquitous standard, all manufacturers of headphones will now have to kiss the ring...
Thankfully these are only rumors so far, but the point still stands. There is no current or emerging technology that brings any benefits to the table without significant drawbacks.
If it ain't broken, don't fix it.