Gay marriage will have no impact whatsoever on heterosexual communities, just as racial integration in the 60's had no negative impact on White (the majority) communities. It simply overturned an ugly, immoral attitude that upheld segregation. The same goes for legalizing gay marriage; it will grant the LGBT community a right that has been immorally denied to them.
One of the major reasons that gay marriage is currently illegal is due to the religious interpretation that "homosexuals are sinners." Such a religious perspective should have no place in federal, legal matters in the United States. We live in a secular society that maintains secular views. The Ten Commandments do not define our legal system, so why does the religious argument "marriage is the union between a man and a woman" keep so many happy, gay couples from becoming legally married? Legalizing gay marriage will have no impact on religion and/or the religious