The big trend here is the cost of wifi enabled microprocessors dropping down to nearly nothing. Last year we were excited about raspberry pi dropping prices down to $30 for sensor-enabled hardware on the network.
This year you can buy a wifi-enabled microcontroller for _$3_ (search esp8266). And that's not even in volume. At that price, pretty much anything consumer electronics companies build can be addressable on the network.
Add to that voice control, which is crude but usable and built into every phone already and improving quickly. The idea of walking into your house and looking for a light switch is going to feel like walking up to your TV to change the channel did 30 years ago when the remote went into wider use.
I find the economic arguments about not saving money using IOT devices a little amusing, on HN especially. My guess is that almost everyone reading this forum spends a shitload of money buying techno gadgets for reasons beyond "it saves me money."