Coming out with a hair/outfit pack would sound a lot like an admission that something was lacking in the first place, and that's something all developers avoid. How long did it take them to acknowledge that some areas of DA2 could use improvement? Ultimately, they never did resolve customer complaints with DA2, but they did make changes going forward.Sadly, that's probably what's going to happen here.
On a conceptual level, I don't have a problem with unisex hair. We have cultural expectations that men will have shorter hair than women, but Thedas needn't share it. Of course, given the fact that most of the styles have sideburns and/or a receding hairline, they seem to have interpreted "unisex" as "universally male." And that's a concept I don't appreciate.
If they can strip a DLC of armour to make another pack items, I doubt they would really care about "admitting" anything. 
DA2 was improved in some areas. The DLCs are away from Kirkwall, for example. and have different enviromant. Of course they couldn't put there playable races on a game already made.
The cultural expectation about what is feminine and not is something that still surprise me, since only my grandmother dared to say to me I seemed a boy the first time I cut my hair, when I was barely ten. And my mom shutted her up, since she was the first with short hair.
My cousin cut hair for work, and she cut regularly short hair on woman. I've always seen more woman with short or chin lengh hair than long haired ones. That's why I can't understand the guys that can't like women with short hair. Have they ever look around? Do they know what a woman actually is?
The problem with DAI hair are the receding hairline, that as you said, it means the hair aren't unisex, but male hair slapped on female skulls, and the quantity of shaved buzzcuts. I don't know nor man, nor woman that would be so keen to have such hair in a fantasy setting! This is the problem for me. I expect in Thedas to see long hair, I expect to see long, wild hair on male characters, and complicated, elegant braided styles on females. I expected to see braids and ponytails, and all the in between. I expected chin lenght hair, I expected little braids here and there to adorn the scalp.
Surely I didn't expected so many not "short", but shaved military-style buzzcuts!!! those are definitively non-fantasy friendly! 