The ultimate portable, wearable computer
Imagine a person travelling by train. They're sitting at one of those shared tables. They wear a Hololens. You're watching the creepiest thing ever: They seem to be typing on the table... but there's no keyboard... and they's moving a mouse that isn't there.
This is what's happening: A full computer in their headset. Holographic monitor, keyboard, mouse.
No need to unpack anything, no worries that some fellow passenger will spill your drink on your laptop when the train rocks to the side too hard. You can add and remove monitors as needed, or even extra virtual computers (running different operating systems too).
Imagine: Coding on your multi-monitor setup, on the train, without having to carry or spread out a full lab worth of equipment.
Add this little printer: http://www.zutalabs.com/ and a stack of A4 sheets of paper and the world is your office.
The only things that I can't figure out how to do are: 1. how to receive mail; 2. get a bank account; 3. car registration, insurance and tax (should you prefer an RV to the train), in a nomad-friendly way.