The 40 S&W is slightly more dead than the 45 ACP and 9x19mm. Just because the military decided to stick with the 9mm and the FBI has gone back to the 9mm does not mean that every law enforcement agency in the U.S. is going to trade in their 40 S&W pistols for 9mm pistols. The round is a good defensive round and will be around for many, many years to come.