Industry has had IoT for quite a while
You do realize that industry, i.e., big machines and such, has had IoT for some time, right? It's just that nobody has made a big deal about it. Industry does have quite a lot to monitor, from the tire pressure in dump trucks to all kinds of factory processes. But it's an intranet, for local use only, security breaches aside.
Yes, I have IP cameras, but I don't open my network to the outside. That's part of the sensible nature of security, is to not expose what doesn't need to be exposed. So what about the fridge? The fridge isn't supposed to nag, it's supposed to report what's in it when you're at the store, trying to remember what's in it. You do realize that the alternative is to write things down on a slip of paper, right?
Look at all of the things that we use remotes for today. You realize all of that's IoT, but without the internet, right? I remember when a friend of mine, madly obsessed with remotes, had them all lined up on his coffee table, and then he wanted to turn off the telly. But that didn't work, because he'd grabbed his calculator instead. (It was hilarious watching him mash that red C/CE button!)
So what it comes down to, do we need industrial control for the home? Maybe a bit, but that's all there is, really. Old thermostats need to be replaced with something a bit better, but mainly because the old ones stick a bit, and don't turn off the heat when they should. But it's not because we want the heat only when the electricity is the cheapest.