It is a pretty ridiculous thing to be getting all up in arms about. It didn't say you'd have to live with someone of the opposite sex, just that you could if you wanted to.
I lived in a coed dorm, and on my floor we may as well have mixed up boys and girls. Everyone left their doors open all the time and people just wandered into and out of each others rooms. We were a pretty close floor, I don't see how it would have made all that much difference if I would have shared a bedroom with one of the guys rather than with one of the girls.
Its all about choice anyway, if you wouldn't want to live in a coed room, you don't have to. Personally, I always got along better with boys than with girls anyway, so there probably would have been less drama if I'd lived with a guy friend.
Unless they are forcing coed rooms, I don't think its a big deal at all.