The currently available hot-spot based options do not work for streaming any volume of data. The main reason being that the cellular infrastructure does not have the bandwidth to accommodate it. For example, if you go to a large sporting event, wireless data almost always comes to a grinding halt.
Cellular bandwidth is very expensive to provide. Carriers have dealt with the limitations by imposing data caps that cost dearly to exceed. It works for them, no doubt.
There have been several threads in here with "vigorous" debate with regards to campgrounds' ability/willingness to provide real high-speed broadband access. Obviously, if the service is not available to the campground at all, the issue is moot. If it is available to the CG, the issue becomes cost to implement, as well as whether or not to charge for it (and how much).
With some planning, I am able to bring my iPad to the office, download some shows and movies, then play them through my APPLE TV back at the campground. Not the most ideal options, but it avoids the huge data charges that streaming a few movies a week would cause.