Little kiosks, where there's no gas, that have a MTO screen to order. This is a hybrid of the drive thru idea, Sonic, and your local PNC branch.
Basically, there would be a menu of items to order and be delivered via insulated, air-sealed pneumatic tubes. You can stay in your car to get your groceries, and it would be faster than having a drive thru where it's first in first out.
You'd need some sort of workaround for drinks, but this would be competition for Amazon's innovations with delivering groceries.