edit: Never mind, I read your answer up above. Well, anyway, a judgment call.
It sounds like a really interesting idea for a computer game: you're the president of the world, and an asteroid may or may not be going to hit the planet in so many years. Can you bring the planet's resources to bear in time to prevent it? Can you develop the technology and send the mission without bankrupting society and causing mass unrest? Can you delay that preparation and develop better technology to figure out if the asteroid will really hit?
Or do you play the villain, letting the asteroid hit, but building fallout shelters to survive with your friends while everyone else perishes? Can you do that without the populace catching on? Can you get it done in time? Can you outlast the "asteroid winter"?