Sibling comment mentioned some state laws. Also, at least in the case of some of the gas station chains that have Superchargers, they are free to ask the trucks to leave or have them towed/arrested for trespassing.
I would assume numbered gasoline pumps will see no change. Gas stations can attract purchases from electric car owners by providing low-cost chargers away from the pumps.
If anything, gas station owners are just capturing a new market segment.
(For the record, I'm a big fan of gas station hotdogs and beef jerky.)
I too am a big fan of gas station hotdogs, and I must say one station's dog is about as good as another station's dog. Time spent on the warmer is more important than brand of dog at a gas station.