Cables are subject to breaking (specifically the connectors) and given how hard it is for many phones to listen to music via headphones and charge at the same time, I can see the appeal. Also, jacks are only rated for a limited number of cycles (connects, disconnects) due to the fact that there is mechanical connection taking place.
In the future, I imagine wireless charging being built into key pieces of furniture (see Ikea's attempts) where you might like to charge your phone. At the makerspace I run, we are embedding wireless charging into our custom-built tables which, I have to say, is super nice just to drop your phone down and have it charge.