maybe.. if the dumb phone could tether data for the tablet... on 4G speeds.
but then i would have to carry a tablet .. which kind of kills the benefit of reducing bulk with the dumbphone.
i can see a small smartphone (4" screen) with really great voice commands.. 10x siri. then free tether 4G data to a tablet.
DropBox: register for free space (we both get 500MB extra space): http://db.tt/sWYVl3j6