Honestly, slow death by the effects of a dinosaur extinction level hit would be horrible. No sewage treatment, no water, no food, gangs fighting for survival against normal people.
Would take a long time to actually die.
“Experts” keep saying the mathematical chances of a hit are low, then someone finds a surprise new object they didn’t put into the calculations.
“Between 6,100 and 17,000 meteors large enough to reach the ground strike Earth every year, which equates to roughly 17 to 47 per day.” ((Most go into the oceans or uninhabited areas of the planet.))
—U. of Manchester.
A civilization debilitating solar pulse (think EMP) to a near extinction level event from the Sun is more likely than a killer asteroid, imo.
Those are much better tracked than they used to be. Several serious events have missed in the last several years just because they were not directly Earth directed.