My friend and I came to this conclusion like 20 years ago. Once the shock wears off everyone's minds will adapt, with most people falling into "great, there's aliens, but I've still got to get to work." I mean the US only sorta screeched to a halt for like a week after 9/11, and most of that was the airline industry. The pandemic was way worse, but the problem was very different. So unless the aliens do something (good or bad) that affected everyone directly - war, disease, super powers, apotheosis, free global WiFi, w/e - we'd all be back up and running in like 4 hours.