This HomeKit presentation is such a Silicon Valley dream. It's almost like a 1%-er thing. Just feels unreal, average people are not like that. Interesting to see who really is the target.
I think more people want an automated home than you think. Not sure if you grew up with the Jetsons but I grew up looking forward to the day where technology automation can make life easier.
If you have an older house homekit can add a lot without a re-wire. Ie, you have a lamp but no switch wired for that socket etc. You want to do a ceiling light in your kids bedroom but since it's temp are using an extension cord for the hanging light and want it switchable.
Having a HomeKit home is easier than you think. An IKEA or Hue gateway connected to your router, a few lamp bulbs, and an iPad or Apple TV to control it all. That, at the least, will give you "Hey Siri turn on the lights".