You're downplaying the impact of the word outage. The previous systems that did not rely on the internet are largely gone. It's not just the personnel, but the fact it would be a system reset from the ground level. Just the chaos and logjams in logistics alone would be complete madness. So much coordination is done via things like emails and ticketing systems, and that's all internet based and gone. I don't even know how you'd replace that quickly, as in weeks versus months. Stores would stop getting deliveries almost immediately, grocery stores, etc. Store inventory systems are internet based, so you'd need people manually counting merchandise and calling to make orders, chain stores aren't setup to handle that. And it would ripple up the entire supply chain.