The "end of the world" is really kind of misleading.
Armageddon is not going to destroy the world's infrastructure. The survivors will enjoy the "spoils" of those who don't survive. Governments are made up of concepts in the people's minds, so destroying buildings mean nothing. The people will be killed. The Bible gives us the context of a lot of dead bodies whose flesh will be eaten by the birds, picked clean. Then crews will come and bury the bones. So that is close to what happened in Egypt where the firstborn just dropped dead.
So maybe people will go crazy, walk to some public park or something in the nude and then drop dead, making easy pickin's for the scavenger birds.
In the meantime, rather than the "end of the world", a better concept is a CHANGE OF GOVERNMENT. The "end of the world" simply means government by man, influenced by Satan, will end end and God's kingdom of 1000 years will begin. Then after that, JUDGMENT DAY, which could last up to 100 years.