[dhyasama]

The iphone 7 prototype looks like a good start but they can take it much, much farther. A quick calculation: my arm is roughly 34 inches long and an icon row is about 1/2 inch. Factoring in for hardware chrome they could squeeze in maybe 64 rows for a whopping 256 apps on the home screen! There is TONS of room to grow here.

[cincinnatus]

My first thought when I saw it; I used to have a receiver with a remote of those dimensions. Of course now I have one with a touchscreen remote...

[Tichy]

They could add rails for the arm, like for the guns in Taxi Driver, except you could slide the iPhone up and done your arm. That way you could still reach everything with your thumb.

[jerf]

This suggests an augmented reality approach where the icons are arrayed on a curved 2D surface in front of you, with your iPhone being just a window onto it. Or, heck, why a surface when you could have the whole sphere surrounding you? I'm pretty sure we could pack thousands of icons onto that, and just think of the awe-inspiring demos.