Engineers get some respect, and perhaps invent new traps in case they are forgotten in future. Average citizens of third world countries may experience the same sorts of disruption that occur with periodic natural occurrences, e.g. hurricanes, monsoons, etc. Problems with infrastructure should be rectified within a month. The biggest worries are what happens in second world, or emerging countries. There may be a more significant dependence on technology and financial infrastructure, which could cause a much bigger impact.
Money goes where it grows.
There may be large flights of capital from these countries that could trigger regional depressions. Possibly both, and situations like these may require a DoD response. I'm betting superstition replaces reason for the majority of people. Even though in many cases foreign societies are less technology-dependent, these same societies are likewise less technologically savvy and will pay less attention to remediation and contingency planning as a result. Widespread lack of understanding of complex systems, chips, and failures.