One natural disaster is solar storms, which can take out sattelites; another possibility, to dial it up to over 9000, is that sattelites will be a likely target

One natural disaster is solar storms, which can take out sattelites; another possibility, to dial it up to over 9000, is that sattelites will be a likely target in WW3. Finally, sattelites and the tools to communicate with them are relatively expensive, while you can get e.g. a Baofeng hand radio for $20-$30.