You may worry, but there is no evidence that two loving gay parents in a stable relationship damage children whom they raise. I know one such couple, who adopted two kids, out of a foster home, and they are marvelous parents. The kids are thriving. I have seen it with my own two little beady eyes. There is a rigorous screening process for such adoptions, at least in Orange County, and the applicants must go through a 100 hour class first.
Yep, the world is changing, the gay people that have kids do so by choice, not by mistake. And the ones that go out of their way to adopt really do set a high standard.
And, like anything: negative, ill informed sterotypes fall when people see the reality that destroys their bias.
There is plenty of evidence about the statistical probability of children turning out better in the care of their married biological parents. Your model lesbians are not what would happen to children within society at large if their outstanding efforts were judged to be the norm for all gay parents. You would find plenty of trailer trash among the rank-and-file gay parents if legalization were widespread, and the results of their average and below-average efforts would skew the results even lower than they are now in relation to the married biological parent families. Judging all persons according to your friendship emotions is not the correct way to form policy opinions.