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I think the "smart" home will become more common.
I don't mean that we'll see smart versions of new things, but more of the basic things, like Light fixtures, smoke alarms, doorbells etc. Consumers will buy less and less of the "dumb" things until EVERYTHING has WiFi built into it.
I've worked in the home automation industry for over twenty five years. I've been programming "smart lighting" for over ten.
The "smart home" you see today is largely thanks to how cheaply things are made in china and repackaged by mega-corporations. And the consumers' desire to do everything from their phone (with 2 day shipping). Automated lighting control has existed for over forty years. It's been expensive because the parts are built to last for forty plus years and most of the older system were manufactured in the US. Those manufacturers are still mostly making things in the US but a lot of little bits are imported.
An average 2,500 sq ft home could do a whole automated lighting system for about five grand. That's a lot for someone to buy (and install) from Amazon but it's nothing if it's bundled into your mortgage.
Nothing beats a wire. For a small apartment with a few lighting circuits, sure, spend $500 on some wireless doodads. Now you're stuck relying on software updates and firmware updates by your router, your wireless bridge, your smart buttons, your lighting fixtures, your mobile OS, the lighting app, and maybe another app to combine everything, not to mention your "smart speaker" if you want to yelp your commands into the air. On the other hand, if you get everything from one manufacturer, it's built on an isolated network that grants access to your mobile device and the system is self contained and essentially bulletproof until the power goes out.
Lighting is a life safety segment. You won't pass inspection unless you can turn the lights on and off from a physical switch or button that doesn't rely on your home wifi.
It's up to electricians and builders and AV experts (and CEDIA) to convince future home owners that it's worth getting this stuff installed before the home is built rather than letting them decide to buy something prone to failure on their own.
I love smart lighting. I wish everyone would invest any amount of money into it. But, if I'm reading you right, a wifi lighting world is not something I would hope to see become more commonplace than the current path of wired automated lighting. I'm in agreement with you though. It's really sad when I walk into brand new homes that have no lighting control (or distributed audio) at all.
How easily can distributed sound be added if I'm gutrehabbing a house room-by-room?
This is a complicated answer just because there's so many options and variables. We always tell people to run more wire than they think they'll need.
Proper speaker wire is fire rated for in-wall use - don't run lamp cord in your walls. 18 gauge, two pair or four pair is typical. While the walls are open; run at least one Cat6 to TVs, potential wifi access point locations, security camera locations, door bell, light switches, even speaker locations and someplace you think you might want a source component (turntable, etc). If you want controlled shades, they may take special wiring which you'd definitely want to run now. Worse case, 18/4 and Cat6. Everything should start from a central location not far from your electric panel.
You'll need to balance how you want to control the system with how the system you want can be controlled. If you want in wall keypads or touch screens, that control system needs to be compatible or made compatible with your source gear. If you want to control everything with an iPhone or iPad, you'll need to look into a control system that's compatible with that.
Consider that a ubiquitous 110v commercial amplifier can likely power all the speakers in your home but it lacks volume control. Most whole home amplifiers lack a volume control you can operate from a mobile device. There are in-wall volume controls that can sit between the amplifier and the speakers. To use those, you could run 18/4 (and maybe Cat6) from the amp to the volume control then 18/2 from the volume control to the speaker. You could also consider a matrix switcher with preamp. This would distribute one or more sources to the amplifier channel (speaker zone) you choose and possibly give you remote volume control.
Those are just some thoughts. You might want to check out these sites for equipment ideas: monoprice, sweetwater, snapav, russound.
Thanks for the pointers! I appreciate you taking the time.