Playing devils advocate again... The order still falls if any other surviving Jedi are doing the above quote (a great quote by Edmund Burke). All the dramatic suspence is still maintained if other Jedi survived but where doing nothing anymore to defeat the Empire. So if Luke died the order still would have too. Thus, from a certain pov, still make Luke the last of the Jedi and have yoda's dying words still carry theeir full meaning. KotOR II explored the above quote, to some degree anyways, rather well. Though your character (the exile) clearly wasnt the last of the jedi by any means, the Jedi in hiding that you meet along the way had truly lost their way and thus werent really Jedi anymore. Well, to varrying degrees anyhow.