Probably not true for low-level devices like toasters and kettles.
The thing about "low level" devices is that the typical developer will see them as an ideal target because they are "stand alone". (Aside from the issue of feeding them with raw materials). For instance I'm sure some benevolent organisations will grant money to developers who have ideas to make life easier for people with disabilities.
Expect to see lots of examples of such portable things at next year's Ideal Home Show - the ideal place for suppliers to get spur of the moment sales, and for buyers to think wtf was I thinking of when I bought this?
The idea of using toast as a canvas for weather forecasts and QR codes (mentioned earlier) sounds like a good one for developers to exploit. (What is it about toast that inspires geeks? Who remembers the screen saver?).