Yes, I agree that part of the problem is the large casts, including the Big 7 but they aren't going to help matters by making Nero a man, by making Robau a man, by making Olsen a man, by making Keenser a male, by featuring a nameless male Vulcan instead of T'Pau, by making Admiral Marcus Carol's dad instead of her mum. I'm not saying that they should all have been female but if they had been, there would still have been more male than female characters. The fact that none of them were really skews the dynamic.
Quick question: who is "Admiral Marcus" and how do we know about him? Google isn't actually giving me any sources.