He is saying how bad it really is. He is saying the dirty little secret is the world has no money. In other words we are doomed it is a lot worse than anyone is saying. He is saying prepare for it to get a lot worse. Basically open your eyes and see what is going on around you. The news media isn't reporting how bad it really is.
I wouldn't say he believes we're doomed, in the most literal or figurative sense you can imagine (or imply), but I do think he's saying this is serious stuff.
though I wouldn't take david letterman's sarcastic joking about the end of the world as a sign that the media isn't picking up on this. I'd say if anything they were scared to start a panic. If it was a glitch, or a sign of the times, inciting panic is not the way to go about relaying information.