I'll be fine with Batgirl. Maybe not Barbara, Stephanie or Cass would be nice. They can save Barbara for the movies, Gotham or something.
It will be very much like Smallville, instead of Green Arrows, bringing some mainstream attention to Batgirls.
Why would Batgirl ever be on this show? At least with Batwoman there's some crossover with Maggie, there's no reason for a Batgirl to ever show up. Also she's got a damn movie coming up, she's totally off limits. No reason for Stephanie either. Cass sounds like a made up character.
Nothing Bat related is happening on this show.