Call me back when Smart TV's are pre-configured to connect automatically to cell networks. Then we can talk.
I called that one as the big risk a long time ago. As long as you can just not connect a potentially intrusive device to your Internet connection, you always have a certain degree of protection if you want it. As soon as devices can make their own connections, either you live in a Faraday cage or you're permanently at risk if you have any untrusted device nearby.
The disturbing thing is that it won't even need relative expensive access to a cell network before long, because everything from shared WiFi networks (think BT Openzone, for those in the UK) to mesh networks (a distributed, peer-to-peer wireless communications system) via drones is potentially a threat in this context.
The only way to stop this is going to be legislation requiring sufficient disclosure and/or outright prohibiting certain behaviours that are too widely abused, with meaningful penalties for infringement (i.e., criminal sanctions that will pierce corporate veils and throw executives in jail).