Do you really think that random hackers are going to break into your system to control your lights? Or, even to open your locks? No, of course not. There's no money in doing that because they aren't even on the same continent. They're looking for banking info and credit card numbers. If someone wanted to break into my house, all they would have to do it break in a window or my sliding glass door. Now, the alarm would go off, but in reality, if someone wanted to get in they could. The whole point of security is deterrence. It's easier to break into someone else's house without a security system than into one that does, that's why security systems work. It's not that they're fool-proof. It's that there are so many homes without one.
The same with your cloud based home automation. There is no reason to break into a home automation cloud system because there's not enough money to be made from it. Let's not forget, that while they are criminals, hackers are doing it for a reason and not just for the hell of it (most of the time). And most "hacking" is not breaking in by busting codes, its stealing info folks give away unknowingly.
And as far as "end of the dirt road"...i'm sorry, but if my home is going to rely on something to work at all, it better be 100% of the time or damn close to it. The last month I was on ST I lost internet on a Sunday afternoon and I literally said to myself, "well, I don't really need to leave the house. I don't want to have to go around and do all that sh&t by hand." Now, while I am a lazy bastard, some of that really is because once you have it set up to be automated, you expect it to be. And when it's down, it sucks. I agree that the cloud will be the future but for me, only after it is a hell of a lot more reliable than ST was and only when my internet connection is a lot more reliable than "Slime Porner" or "Speculum" are.