Feels like you're assigning probabilities out of thin air. For example, not sure how hardware failures would wipe out the entire human race, or even cause the collapse of modern civilization across the planet - like every single piece of critical hardware in all major cities would somehow have to fail in a limited space of time. It would require controlled electricity (for lack of a better term) to spontaneously disappear - the laws of physics would have to change, or maybe every human to contract a virus that makes us allergic to being near large amounts of electricity. Not to mention there was nearly modern civilization before electronics were invented that we could fall back to.
Sounds like a cool premise for a novel, but something fanciful to the extreme.