Most emergencies would put us off line for maybe two weeks as you say. But something serious could knock us down for 6 months or longer. Actually, losing your job in this economy could put you down for at least that long. If the emergency was broader, and the economy was disrupted in some serious way (war with Iran, maybe?) as you say, zombies will roam.
In that case, we'll want a bigger pantry, and a shotgun, and good neighbors we can count on. We'll have to build our own microeconomy in a case like that, and stick together.
At least two shotguns. My wife backs me up, and can reload. Have plenty of ammo, but my Mossberg only holds 9. And thank God for good neighbors.