Fort Wilderness is an unusual case. Due to the large area of the park compared to any other campground and the fact that Disney never does the Chevette, they only do the Cadillac it is a big job. To build a WIFI network on that scale at Magic Kingdom is easy. They have an extensive network infrastructure with every building connected to it. This makes it easy to add WIFI to the entire park. Fort Wilderness on the other hand does not have that infrastructure in place and does not have all the buildings where they can be installed. This means building an extensive fiber optic network and putting up poles to install hundreds or thousands of outdoor grade wireless access points. This is not impossible but it is a large, costly and complex task. I suspect one day they will have a pervasive WiFi network that is as stable as the network in the rest of their parks and hotels and nothing like the average campground.