Never mind a foot in the door...
The door is wide open for nasties, intentionally devised but mostly otherwise, to be bought into their homes by unthinking consumers.
No doubt like the first few IOT devices, they will have some novelty value, especially for El Reg tinkerers and the like, but here in Britland our concern should be not just focussed on the technical security stuff, but on the more run of the mill issues.
Our government is relying heavily on IOT to facilitate a massive programme of invasive monitoring and control of our domestic activities.
To whit, the infamous Troajn horse known as the "SMART Metering" project that British consumers are forced into paying through the nose for via their utlity bills.
Yes, the plan is to link your friendly fridge, central heating boiler, washing machine etc. to your smart meter that you WILL install.
The way you will be forced to do it will be in a similar way to the introduction of water meters in Britain. When a new house or flat (apartment) is built, it will be part of the build. For existing housing stock, when the consumer moves out, the new owner/tenant will find they have to take the smart meter when they take over the property.
You will then see on sale boiler control systems, ovens, freezers, etc. that will be compliant with this smart metering system - maybe the retailers and installers will eventually only be able sell these kind of devices - like the way you have to buy condensing gas boilers now.
For early adopters, the bribe will be that you get discounted electricity/gas/water bills.
In due course, you will find that you will pay a lot more for your utility services if you don't use the smart meter system with "approved" appliances.
The deal will be that "un-smart-metered" services will become progressively more and more expensive than un-metered. Smart meter households will be able to pay a lot less per unit of whatever by allowing the utilities to limit the use of their ovens/fridges/kettles etc, to off-peak times.
If they are well off or desperate, the mart meter household will be be able to overide the device limits, but will have to pay heavily for the priviledge.
Here's a scenario, it's Sunday evening Winter 2025, the kids need their school clothes washed and dried for the morning.
Unfortunately there is a big energy gap in the UK. We now have no nuke power stations, and the new Chinese/French designs are running 10 years behind schedule and the first won't be ready until 2035. World natural gas supplies are up 25% over the last 10 years, but world demand has gone up 50%.
UK shale gas is coming on stream in larger quantities, but early bores have been shown to have a very short commercially productive life and so government is having to underwrite all new development and infrastrcuture costs.
So if little Jonny needs his school kit cleaned and dried by tommorrow, it will costs his ma & pa £25 for the priviledge.