User blog comment:Thailog/Ep. 201 "Happy New Year!" discussion/@comment-98.180.11.2-20120428152612/@comment-1629132-20120428155153

1) they want to show the new characters more

2) In the comics Dick eventually became Nightwing and later Tim Drake became the new Robin. Jason Todd actually came after Dick, but since he was not well liked in comics and was killed off (only to be revived) he is usually not used in animation.

3) I'm sure he'lll show up eventually.