Whitney biopic would be interesting but they would never allow them to tell the ugly truth it would be very whitewashed. A Beyonce movie would only work if they got behind the 'perfect' image she likes to keep. A biopic only works if there is real conflict, struggle and a strong social connection.
Personally, I don't even like biopics, the only reason SoC interests me is because of the social awareness NWA had and its relevence to today.