"Traditional" home automation tech does exactly that angle. Turns out "upgrade every existing switch" does not have the mass-appeal over a lot cheaper "replace

"Traditional" home automation tech does exactly that angle. Turns out "upgrade every existing switch" does not have the mass-appeal over a lot cheaper "replace one thing, do a bunch of things with thing" offerings. Most people need to have the latter before they get the appetite to invest in the former. As annoying as they are, "smart" plugs/bulbs are a lot easier and cheaper to deploy in many cases. It's an interesting balance IMHO. If you can control everything you can build a lot on top, but even just being able to control a few things might already provide you a lot of benefit.