Sadly, I think there are two, very basic, problems with "home automation"...
First - With no set "standard" to work with, we (the consumers) are left to piece together a system from a hodge-poge of available components. By definition then, an "integrated" system is all but impossible to create, unless you have a fair amount of money to permit not only hardware modifications to be done (and paid for), but also programming / software writing. A "expensive" proposition...
Second - The "industry", for all our "talk" does NOT think home automation is even remotely a priority for the "masses". A "techno-geek", here or there, yes, but not the average consumer.
Without the second, you will not get the first.
Sadly... The second (to me) is the simple result of no one really outlining what the REAL benefits could be. Sure, we see a bit here or there, but it is about as disjointed as it can be. Until someone decides to truely invest in the idea of HA and promote it accordingly, it will not take root, to any appreciable amount.
As consumers, we need to be told what this will do for us in a way that we can understand and see real benefits from. Not "off the wall" concepts of futuristic homes, but down to earth, realities that we could feel, today...or even tomorrow (short term). Not to mention, at a price point which is do-able for the majority.
There are also "some" issues with using existing wiring, etc., that need to be addressed... ie., for this sort of thing to take hold, it has to be available, not only for new construction, but also to be retrofitted into existing buildings, without having to rip out walls, etc. It's there, in other forms, it just needs to be adapted for this type of use.
Could any of it be done? I believe so, but I think, at this moment, there is no one company, no group of companies, who will bother. The ROI just is not there.