Why did they stop making this kind of games!?
They milked the franchise too much in a fairly short time span:
Commandos: Behind Enemy Lines (CBEL) was released on July 1, 1998. Commandos: Beyond the Call of Duty, a set of new Commandos missions issued as a standalone game, was released on March 31, 1999. Commandos 2: Men of Courage, a full sequel, released in 2001 Commandos 3: Destination Berlin was released in October 2003 - which isn't too bad. But there were also the following games: Desperados: Wanted Dead or Alive came out in 2001 and Robin Hood: The Legend of Sherwood in 2002. Despite being from a different studio than the Commandos series, they looked very similar and game play was almost identical.
So we have six near-identical games coming out between 1998 and 2003. It works for the sports games and the brainless shooters because their audiences are counted in the tens of millions but it doesn't really work for any other genre, where the audience is limited.