In terms of "serious use" I think that depends on what you mean by "serious". E.g. my hone automation setup is not static, because I keep finding new little things I want to tweak, and often the ready-made solution lack options I'd like to have unless I'm willing to spend time tracking down very specific modules. My time is valuable to me - I'd happily pay extra for a modular system where I know if something is lacking a button for something I want I can literally just plug one in instead of having to search all over for a different model of something.
Of course this will not replace mass market "close enough" solutions.
But I think there are still more than enough people who want to tinker but don't want to have to whip out a soldering iron.