IMHO, jewishfeminist02 and HaKatan are both right. While the number of gay people will not increase (obviously), the number of people who publicly identify as gay and are proud of it will increase.
I don’t think that the OU, or anyone else, has any reason or necessity to go out and protest at all. They can’t change anything and once the law is made, considering that it’s a nationwide law and not Jewish-specific, why is it really our business? If Jewish men or women want to marry each other in a Jewish ceremony and have it be a Jewish wedding, this Supreme Court ruling is not going to make it any more mutar.