I have told you before Navy, that I personally don't have a problem with this (I can't say the same for my husband though, especially if I were still active). I have changed in the same area as men that I served with, as I've also told you before, and it really wasn't a big deal. Those guys were certainly able to control themselves.
I can however, see major issues with coed military living spaces, on a practical level. Reasonably speaking, this will never happen. First, who do you think a military wife is more threatened by, a female soldier/sailor/Marine or a gay soldier/sailor/Marine? Ditto for the military husbands. Spouses have at least some influence over military policy, and there is very little chance that military spouses will accept the military putting men and women together quietly. Second, there is a big difference in women and gay men (since most of this worry is actually the thought of gay men serving openly, not really so much for the gay women). It's pretty obvious how a man is different than a woman, not always so openly obvious as how a gay man is different than a straight man. DADT being repealed and the rules against gays going away won't actually force gay men or women to admit they are gay. And fewer of them are going to actually admit to being gay if it means being ostracized to a separate berthing because of it, most likely. So exactly are you going to force someone to openly admit they are gay? Do you really think the military is going to spend extra money on investigating someone's sexuality just to be able to put them in a separate berthing?