No big thing? Hardly. It's another step in deChristianizing our culture. So, it's no longer known as the Young Men's Christian Association (not that it's been an overtly Christian outreach for a long, long time). Now, it's just an ambiguous letter, something that will grab the attention of a very short-attention-span culture.
We're seeing this trend throughout the nation, although it happens on such a low-key level most people don't even notice. More hospitals, nursing homes and other care-giving centers - originally founded almost exclusively by Christians - are losing their "St. (Saint) ....." names as they are gobbled up by secular conglomerates and holding companies. The Roman Catholic Church is shrivelling up because they lost control of their own message and allowed their priesthood to be infiltrated by socialist activists and pedophiles. Much of the Protestant Church has followed a similar path, preaching the "social gospel" instead of the salvation gospel, "social justice" rather than equal justice. The trend is seeping out into the general culture, such as it is anymore. Anytime now I expect the American Red Cross to come up with their own "less confrontational" symbol. Wouldn't want to distress those atheists, Muslims, and Wiccans now, would we? Oops; they're already considering it.
Maybe you're someone who doesn't believe in God, so all this hullaballoo doesn't really mean anything to you. I urge you to give it a little more thought.