You can start with Moore’s law. It’s from 1965. Can you think of something such predictive?
The results today are i.e. the brand new MacBook air 11″.
It’s so small that ports, with they unreducible size, have to be moved off. Only USB endures.
The notebook example is good as it clearly shows us where the shrinking process will stop at: screen size.
That defines the limit. That’s the lower bound.
If we refer to mobiles, we can see today they shrunk to watches size.
The limits? Not the keys, you can use voice control. Not batteries, as tomorrow a new technology could emerge enabling us to grab energy form air.
We could even shrink more. Much more.
So why mobile handsets have change the derivate of their “shrinking trend function”?
(getting bigger again, but is it a huge mobile or a small TV?)
Because screens have turned to be the real enablers.
Keys have turned into touches to the screen. When battery will turn into a slim transparent layer behind the screen, you’ll finally have the ultimate mobile device: a wireless screen.
So, if you have to think of a device today, think of a screen.
What’s the next step? Can we get rid of screens one day? Can we think of a new paradigm of interaction?
The immediate answer from futurist is: brain. Use imagination, think of one think and make it happen. This will exclude eyes. I don’t believe that. There must be something else.
Can we interact in other ways with devices?
So what’ s the real limiting factor? The screen? Your eyes? Fingers size?