Well when you fail to build up your POC over the past 40 years. It makes everyone fair game to get race changed.
There is NOTHING preventing DC from having the Birds of Prey from the 90s run except one thing. The lingering failure to build up POC.
Because what good is Dinah being black in a movie? She's not going to change her race in the comics. It's not going to boost her up because she's not the same as the comic version.
Where is that black Catwoman at? We had two of them. Look at the mess known as Wally West.
If this was being done for BUSINESS-meaning lets help get some more of those BOP trades along with Cassandra's, Harley, Dinah's and whoever else off the shelves in terms of sales.
They were not thinking big picture.