And for the end users, you just put your glasses on and there's a new world out there. Your kids can drop the iPad and instead go for "dinosaur hunt" in the forest. These new gadgets will of course come with completely new demands on mobile networks. The networks have to be faster, more responsive and with less variety in quality and coverage. You don't want your glasses to stop working anywhere. For me, 5G is about securing the user experience on these devices when they arrive some years from now.
The growing physical screen requirements for gaming, video and social media and bulky batteries are the immediate challenge. The augmented reality glasses (or a contact lens in the future) will solve the screen issue - and vastly improve it. Whether it is nanotech, or micro computers, the future energy requirements for these systems will diminish greatly. The power source is going to be a one of the biggest issues in the next 15 years to making the phone "disappear" and go virtual. The smartphone as we know it today will disappear and become an intuitive, responsive, likely wearable solution. Some futurists talk about implanted technology, but this is not viable in an environment where technology is advancing and changing so rapidly.