I guess everybody expects that single task system for devices would be able to displace multitasking OS X. Is that really what you (and Apple) think as future?
I would guess that they may put into devices that do not require much, but simple user interactions:
- cash registers,
- vending machines,
- TV sets,
- standalaone audio control systems (not just portable sources like iPod or iPhone)
- simple user gadgets with screen
- some gadgets with no screen