It's coming. Just like self driving cars.
I scoffed at the whole thing too since I did it a decade ago. A SheevaPlug (long before Pi came out) and a $70 relay board shipped from Austrailia and I had Text, Web and E-mail control of my HVAC system. It was a boring 1.0 but it worked for 2 years.
I put it all off and went about my life and started to get back into it and they've improved a lot in 8 years and in another 8 it'll be ubiquitous. 80% of the lights we use every day are on Z-wave. As are locks. HVAC looks to be a RS485 (It's finally made it to residential) and Alexa. We bought the Echo as a 'eh we'll try it out' and it's become a centerpiece to parts of our house. It's convenient and is actually a timesaver. If your hands are covered in chicken from cooking you can set a timer, turn off the lights, and turn to NPR. There's a Jeopardy app that is pretty terrible but a decent beta of what it is capable of.
Yeah, I know you're listening NSA. You can go fuck yourselves on here too. It's not like it's hard to get out of her range. And if the NSA could decipher twice what she could they'd still know nothing.
That said she still has *a lot* of bugs. We'd pay in a heartbeat to upgrade to something that could understand better. But I don't want it for the house, I want it for the office and the shop. "Alex^H^H^H^H Jarvis, order new oil filters". Jarvis what is the volume of the object I'm holding? Jarvis where are the kids. Jarvis start the oven....
If you're a privacy nut there will be a FOSS version that is N-1.5 versions older than what Amazon, Google or Apple are offering. They're already out there. The only thing that's not self hosted right now is Alexa. A Wand board in the basement is running the house. The house has a home page where I can check all the locks, doors kill the lights and check security cameras. Something that would have taken 45 minutes to do before bed I can pull up and check. 45 minutes saved to do *other* things.
And yes, old tea kettles are fine, if you have the exact same rigid schedule. With Alexa and some Arduino you could say "Earl Grey, Hot" and have it ready in a few minutes. Or just start when you are on your way to the office so it's ready.
The entire kitchen is due for an overhaul. Every appliance there has pretty much a hysteresis bang bang controller, it's off or on. It's inefficient and has poor temp control. Could you imagine if your car's cruise control controller was as bad as your oven temp? Everything from opening the door to how stuff cooks is a first order thermo transfer function any sophomore ME could do better. Between the microwave, oven, toaster and/or toaster oven you should be able to make a highly controlled easy bake style oven that would cover the needs of 80% of american kitchens.
And the point isn't that it saves YOU the 0.1$ a week. It's that it saves 300,000,000M people 0.1$. Tiny savings add up when you scale. Semi manufacturers will fight over 0.1MPG savings per truck when talking to Walmart and other fleet operators.
And if you want to live in the woods and rub two sticks together you can still do that. Amish were left be. No one is going to steal your tea kettle. I can still find VCRs on sale in the store, you'll find your tea kettle too.