I would go into hiding in anticipation of the biggest flame war ever.
What if all the parents were like Juno's parents?
If the continents come together naturally, organisms and the environment itself will change to meet the challenges of a new ecosystem. Humans would be dead by this time.
If it happens instantly, massive earthquakes will occur everywhere. Humans will still die out or be reduced to a very small number.
What if Al Gore beat Bush in 2000?