Yeah, Jack's creator won't let him be reused I think? Even the Stargirl TV show merged him with Skyman, aka the original Star Spangled Kid and the other hero Stargirl is the legacy character of.
As for Arrowette, yeah, she stuck around but was no longer on the team. When they became the Teen Titans, she was finally replaced by a new Speedy, Mia Dearden. Cissie came back in Bendis's YJ (so the retirement stuck for a long time but wasn't permanent) and has also appeared in the YJ cartoon.
That actually happened in the Young Justice cartoon, and I think the comics are heading that way too with Jackson starring in a mini called Aquaman instead of Aqualad.