Since queer folk have/desire/maintain, at a higher level of satisfaction than others, conventional family units the home structure probably would not change much. I could see an increase of poly-functional homes. Mens and women and the non-binary folk living together to achieve an end goal of stability and prosperity.
On a very real tip womens' lives would change over night. From being safe to walk home at night to unwanted pregnancy or the terrible side effects of medication to prevent pregnancy even being a thing. Women in developing nations would no longer fear child/forced marriages, lack of birth control, trafficking, honor killing/assault.
Population drop when all pregnancies are planned. Reduced stress on natural resources. Small population foot prints, possibly by effect of more communal based living, mean less wildlife habitat intrusions.
All the bitter closet case Republicans will be free to be happy. "God made me gay!"
A period of panicked adjustment. Followed by a few decades of positive growth.... until some fuckstick gets to missing feeling superior to someone.
eta: for, true is all heterosexual desire went poof the world would look like the queer community does now. Minus the constant battle to simply exist and some internalized self loathing.
So...the whole world is P-town. With raunchy out breaks of Fire Island and Lilith Fair patches.