I'm always surprised by how heated this discussion gets and I see it in almost every game community. As a female gamer I think it would be nice if they added female models but it's not really a deal breaker. It hasn't kept me from playing Bohemia's games since the original Operation Flashpoint and it doesn't keep me from playing other games.
I figure the biggest challenge in development would be having to include female voiceover for all the commands and animation (which I don't exactly get.. it's not like female soldiers strut around like run-way models.. and every game I can think of with female option use the exact same animations as their male counterpart.. Mass Effect.. Rainbow Six Vegas..).