I was concerned about this happening, especially with DW who wouldn't have a prayer of being able to loosen the lug nuts, so I put together what I call the "old person's tire changing kit" for each vehicle. It's a Milwaukee
battery powered impact wrench with the appropriately size impact socket on it, a battery powered light that stands up and illuminates a pretty good area, and a pair of cheap leather gloves, all contained in a nice Milwaukee tool canvas bag that I'm sure will outlive both of us. At the time Milwaukee sold a kit with the impact wrench, the light, charger, and canvas bag all in one kit, I think it was a bit over $200 and I bought two of them. Apparently they don't offer that kit anymore and the link is the closest thing I could find that's current.
I checked, and yes it does easily remove the lug nuts on both the Honda Accord and the GMC pickup truck. The batteries are checked every six months and are holding up fine.
In reality I fully expect that if we do get a flat we'll call for a service truck but if we can't, or no one will respond, that's "Plan B".