“I told an exhausted older cashier I know that the good part is in a few weeks nobody will be there as they have to eat all the food they stockpiled...”
Yep, people have volume limits as to what they can store regarding frozen and refrigerated foods, so once they’re topped off, things will likely get back to ‘normal’ for those items.
For other items...tougher to predict, may be a long time before people get tired of filling up their bedrooms and feeling like preppers.
It isn’t helping matters that rumors of flying of stores shutting down completely; people just imagine the concept of no stores and probably want to get their Christmas shopping done now...