I'm not sure if this is a real niche. For the device to be any use to a developer, you'd really need an external monitor and keyboard. So you're looking at a developer who for some reason can bring a phone places, cannot bring a Macbook Air or something places, and has monitors and keyboards available everywhere they bring the phone. Does this actually fit anyone's situation?
Maybe it'll become useful in the future with thin, flexible screens. You could carry your 21" monitor in your backpack and your computer in your pocket.
