"Disruptive" is such a vague concept. To me, I would apply the word more on stuff like that: "D-pad interface" => "stylus interface" => "touch interface" (hey MS rewrited an entire OS to go from 2 to 3) "gamepad gaming" => "gesture gaming" "DVD" => "streaming" (whereas "DVD" => "Blue Ray" isn't one) but not necessarily on a single device.