Point is, if everyone were gay, and I mean homosexual and not just happy, there would be a population implosion. Why? Gay couples would be forced to adopt, or go surrogate, and I don't think the laws have changed that much to allow gay couples the freedom to have children at the same rate as hetero couples.
And imagine if things got tighter, through the generations, we wouldn't have to worry about AIDS killing off people, it'd be our own sexuality that would do it.
Just sayin'.
If the majority of people were gay, then it's unlikely that there would be any problems with allowing gays to adopt, as homosexuality would be the norm, rather than the exception.
If the majority of people were gay, then there would be far less accidental pregnancy, therefore far less children to adopt anyway.
It's pretty easy for gay people to have kids. If the majority were gay, it would become a lot easier. It would be as simple as a guy providing a woman with a sample of his man-juice.
People would not stop reproducing simply because they were gay.
The world is already overpopulated, and getting worse. If people had to go to the bother of setting up a surrogacy agreement, they are only likely to go to the bother if they really want a kid. Accidental pregnancy would almost cease to exist, and that would go a long way towards reversing the worlds problems with overpopulation.