There already IS a "What If" show. It's called your local news. Next time some big story happens in, say, Japan, I guarantee your local TV news will have a "what if it happened here" segment.
My favorite was from Cincinnati during a huge forest fire out west. The anchor asked the local parks official, "Do YOU have an evacuation plan for something such as this?
The park official said, "No, ma'am."
The reporter's eyes widened and her nostrils flared..she could smell the blood in the water. Her big "gotcha" moment was coming. She asked the park guy, "And just why NOT?"
The park official said, "Well, ma'am. We'd need a forest, first."
Blushing reporter looks at camera.. "Back to you."
Walking the fine line between jaw-dropping and a plain ol' yawn.