Yup, just like having to tell them you don't want to become a Doctor like the 3 Generations before you, or don't want to carry on the Family Business or Don't want to join Starfleet nor attend their Alma Mater....Coming out to society may go away. Coming out to parents and grandparents might not ever go away, since those people may have certain expectations about their kids - conscious or not. Like that their child will give them a genetically related grandchild, rather than an adopted one, for example. Disappointing those expectations will continue to be an issue, but hopefully before long it will be no more of an issue than if a man/woman couple had to inform their parents that they can't biologically have kids or that they just don't want to have kids, rather than it also being some sort of weird and stupid bigoted and/or "religious" thing.As homosexuality is almost certainly likely to remain an atypical sexual orientation, I don't see "coming out" ever going away, though ideally the pressures associated with it will lessen in the future.
Or it could be more like, "I may look caucasian, but my mother/father is black/Mexican/Puerto Rican/Vietnamese/etc., and fuck you and your racist diatribe"--a conversation I've had with surprising frequency.