I wouldn't have any problem with that.
Cass's plotline will probably revolve around her mother -- Lady Shiva -- being The Light's new enforcer (replacing Deathstroke).
Ironically, one of the two developments for Arrowette I'd like to see is actually her leaving The Team to train for the Olympics as she did in the comics, if they show that as part of the season. The other option would be to use her Our Worlds at War characterization as "The Medic".