It is completely useless, if it requires me to have a constant internet connection.
Even ignoring the parts of the world where internet is spotty and wireless may not be available at all (and no that isn't just third-world countries, it includes people who e.g. live out in the country)... WiFI is a huge battery hog, and anyway I do much of my reading when going from one place to another -- no WiFi hotspots in the car (passenger, not driver
)/plane/train/sidewalk.