The earth is pelted every day from asteroids and comets. This is nothing new. The difference will be when one of a significant size hits. You can all thank Jupiter for your lives, as we wouldn't be here without it. It takes the brunt of hurtling objects in the solar system of all the planets.
And it's just a matter of time before any number of things happen. Just a matter of time before the Sun explodes. Just a matter of time before our galaxy and Andromeda collide. I suppose you could argue that we could all be wiped out tomrrow, but our sun won't die out for a few billion more years, which is true, but is there really any sense in worrying about it?
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