I wonder if part of the reason why sites are doing this is because RV parks end up with 1/10 ranks just because they don't have 1 terabit/sec wireless connections with sub-millisecond latency to every Youtube, World of Warcraft, and porn server on the Internet.  Reading reviews on parks, a place could be quite close to utopia, but because it doesn't have perfect wireless, people trash it completely.  I've read more than a few reviews on parks stating:  "The park is perfect, the hosts were polite, the sites level, the electric flawless, but the wireless is glitchy, so all the previous is pointless.  One star."
I understand full timers and seasonals need reliable Internet service, but for people like me who like to unplug, Wi-Fi access has zero bearing on anything else in a park.