No matter what the US Supreme Court has decided "legally" - the "nature" of the Sacrament of Holy Matrimony has not changed. Holy Matrimony, in order to be "holy" MUST be between a man and a woman and can NEVER be a "same sex union." Why? Because God Himself has declared that homosexuality is an abomination in His eyes. We cannot call something He considers abominable "holy."
One problem I have with "us" (not the US) is that "we" had allowed for "our" terminology to be used and linked into the "legal" system. Now, 100, 200 or more years ago we would never have thought ANY court would "legalize" homosexual unions, much less the Supreme Court of the United States of America! But, this has happened - like it or not, it is here - and likely to stay. Back to my point, the use of "marriage" in the "legal" system should never have happened in the United States. "Marriage" has been and continues to be primarily under the authority of churches - the "state" merely provides a "license." The actual "ceremony" most often (even still) happens in a religious environment. Yes, especially in more recent times, a "Justice of the Peace" marriage has become more popular with our less and less religiously accepting society. Therein lies the rub, that which USED to be primarily a "church" function has been usurped by "civil" authorities to becoming a purely "civil" proceeding. I'm actually OK with that, if "they" want a "civil union" with all the rights a "married" couple has, fine - but let's not call it "marriage," and we STILL won't call it "Holy Matrimony" for the reason(s) stated earlier.
Scott Hahn also posted a meme to Facebook, which I will share as well. We need to keep in mind, as far as "WE" are concerned, nothing has changed! "THEY" may have more "legal" rights now, and fine - let "them" - but what "WE" should do is refrain from calling it "marriage" and especially not "Holy Matrimony."