Much, much rather have Supergirl than Superboy in this franchise.
If anyone should take over if Supes would be gone, it should be Kara.
Top ten favorite theatrical superhero movies:
1. The Dark Knight | 2. Superman: The Movie | 3. Batman Begins | 4. Captain America: The Winter Soldier | 5. The Avengers
6. The Dark Knight Rises | 7. X2 | 8. Spider-Man 2 | 9. Batman Returns | 10. Iron Man 3