This would be an insult to both characters:
- to Terry McGinnis because HE IS Batman Beyond and the whole thing about Batman Beyond is a new character taking the mantle.
- to Barbara Gordon because they would be shouting to the four winds that you don’t believe that Batgirl is an interesting enough character to carry her own movie.
These Hollywood imbeciles try to fight discrimination and exclusion by being sexists themselves. You can’t win with this lot.
IT would be better that they just don’t make a Batman Beyond movie.
.