Not really, especially not wifi that is reliable enough for streaming and likely not at public campgrounds. They often cost less, and may not have the equipment and expertise to install/maintain wifi networks over a larger geographical area (compared to a smaller private campground/lot).
Improved campground wifi will probably become more common as customers demand/expect it, but it'll probably be a slow transition.
This is becoming less and less the case with today's advancing technology. A large majority of TV programming now is aimed at the broadband/streaming internet market. Netflix, Amazon, Hulu, and even YouTube are taking over the TV markets... not just old movies and video clips anymore. In fact, Amazon Prime and occasional Netflix is all we have at home for TV now, plus the free over-the-air HD antenna networks (which often don't come in that well). We haven't paid for heavily-commercialized satellite TV for many years.
Although we are used to "doing without" our online shows when camping, I can see how many folks accustomed to streaming TV (and new to RVing) may assume that it's a commonly-available service at campgrounds.