You guys forget, the German exchange went sideways in market share in the Bund for a couple of years, when it shifted, it left the Liffe in days! A couple of people have made the point that the S&P is licensed, a valid point, but the Eurodollar isn't. What is the most heavily traded floor contract? What happens when this leaves the floor? Options aren't very easy to trade on the screen so they may stay around a little while. What about treasuries? Read this: Here