I think it would be quite convenient to have a cell notification go off when the oven has reached the right temperature or has finished cooking, or an alert that my stove has been on for over an hour. I wouldn't object to computer control for lights either (press a button to turn off every light when it's time for bed, etc).
None of these features seem particularly valuable to me, but I'd personally more than happily spend a few thousand for a wired house if I was already dropping hundreds of thousands on the house itself.
Of course your opinion is obviously different, but these systems already exist in multiple forms, so there's obviously a target market for them. The existing technology is also very crude and haphazard for the most part, so anyone who comes along and strong-arms the players into a single standard will probably profit handsomely.