Prophecies of Doom

We have prophets of fire and doom,
We have witches that ride on a broom,
Seers that foresee the world goes in a boom,
Sages that know every dark end and gloom,
Worlds collide with meteors and asteroids,
Are giving us gout ulcers and hemorrhoids,
But after the grime stones ashes and blast,
Who is stuck with vacuuming all the dust?