How does that solve anything? Your WiFi should already be password protected anyway. It's other people's routers with open networks you need to worry about.
That’s a legit concern. If Samsung made a deal with, say, Comcast to connect to the ever-present “xfinitywifi” SSID, then it wouldn’t matter if you’re blocking the sly TV from your own network.
That's a very valid concern, especially since most consumer-grade ISPs are in bed with the media industry and would be very interested in the tracking data from these TVs.