>This type of thing would really need to be implemented at the township / local community level at least,
Even better - both. Increase the independence and redundancy in several steps, making the grid more reliable and less prone to failure from single events.
>It’s simply not realistic to think every private dwelling can or should have this kind of capability,
Why not? You can get 10 kwh of storage for the price of a phone and laptop. Any EV has more battery than what's needed to power a home for days, some of them already have the capability to do so when combined with the right charging station.
Of course not everyone will have it, but surely battery storage could become as common as air conditioning or central heating even at current prices.
The article is discussing energy storage on the order of 4-6 months, not days. So, sure, you can hypothetically conceive of a world where “many” people have $100k of battery storage, but that doesn’t make it a sane world or a solution in the large.