I am always hopeful until the actual show comes out. Things can be improved, they can get better.
Regardless, I think it would undermine Ollie's specialness to show three other archers almost as good as him right from the start. It's one thing to have them all running around in a world full of superheroes. But another thing entirely to have them be the core of a team show, with a pretty much identical power set. Fleshing them all out at once would leave very little time for the antagonists.
Sounds like a solid team up until now. Moreso, I may say, than what the Wonder Woman pilot got (with the exception of Adrianne Palicki, I'd say).