The son Tim's split from his gay spouse is a reminder that gay or not, he was not prepared to make the sacrifice to make a marriage work. So much homosexuality is based upon innate narcissism and truly connecting with someone else, which marriage requires, is not part of their psychological profile.
Gays are going to get the right to marry and I am betting that their divorce rates will equal or exceed heterosexual rates.
They will have very open, plural “marriages” no doubt.