For a Quick Overview of How to Manually Disconnect Your Garage Door Handle - Click Here
I can see requiring homes that are in a wildfire-prone area to be subject to this requirement, and/or making it an option for elderly, other-abled, or small-of-stature folks who don't feel comfortable with their ability to manually raise the door -- buy everyone in California? Seems like overreach to me.
How about a simple battery pack to convert your existing door? From what I've read, the batteries require DC-powered openers and of course most installed openers are AC powered. So that option is out -- at least for the moment.
I've also read that battery packs will last, on average, about 3 years. So now homeowners will have to remember to swap out their battery pack every 3 years or so, at a cost of $20 to $40 (not to mention filling up landfills with a new source of e-waste). And if you forget to replace your battery pack? Well, there's always that emergency release cord with the bright red handle!!