For purpose of discussion, assume that due to bad luck, this asteroid has evaded the detection of all amateur and professional astronomers until about six months from impact. The asteroid is too large to deflect with humanity's current spacefaring capabilities, and the general scientific consensus is that the impact will end all multicellular life on Earth.
What do those six months look like?
I was so pissed at that movie's end... Right up until the very final moments where it was all worth it 😁
The ending was supposed to be even better: the capitalists were all supposed to start bidding against each other for "someone" to build them a house on the new planet, until they realized that there was no one left to build one. Labour is the source of all value and so on and so on...