If you are having a widespread, long term power outage, those gas pumps will not run due to not having electricity.
Do you live in an area that has frequent power outages, then maybe this would be a concern, but in most areas an outage is pretty rare and are short term. If your area has unreliable power, perhaps they should be putting more power transmission lines underground?
Defeatism never accomplishes anything.
Personally, I've never found gas stations to be the beacon of reliability. They go down quickly in any kind of shortage situation. During the last ice storm here the local station ran out of gasoline in a couple days and diesel right after that. But I was able to buy propane without interruption, so that was good -- it doesn't rely on electricity to be dispensed. This is why my portable generators are now all dual fuel.