> My guess is that in 30 years, having every light in your house controlled by a physical switch will be as quaint as TVs with rotary channel dials.

Maybe, but it certainly won't be echo/home that results in that. Voice control for lights is fantastic in certain situations, like when you're in bed and want to turn the lights off. Or on the couch about to start a movie.

But it absolutely sucks to say "alexa, turn on the lights" when you walk in the room. It's slower and it's more frustrating than just flipping the switch right next to you (and the connectivity delay is readily apparent) Maybe motion detectors or some other form of tracking people in the house will augment this to relegate switches to the dustbin of history, but it's definitely not voice assistants and crappy phone controls that are going to do it.