That could be possible given the next season of the TV is supposedly the last.apparently they can not due to overseas contracts which Batgirl did not have. One of geek youtube channels I like was saying that one reason why Batgirl was killed was because overseas distributors were not willing to do what DC/WB needed. The Flash has had those contracts in place for 3 years and if they kill the flash they will have to pay out money to them. With Batgirl, they have shelved in for 2 years and then figure out what to do. 24 months is the magic number for being able to apply the entire lose towards their deficit.
some other geek youtube channels are suggesting that scenes with Grant Gustin were in fact reshoots and that Gustin from the TV show may take over the movie franchise