I think its already happening, when I came out as a child I was subjected to mental abuse and lets shrink it out and fix him from my dads side of the family. Then when I came out to my mom's side and wifes family I was quite shocked by the level of acceptance. Many family members and my wife cried for me that I had lived in such despair all those years.
There are some exceptions but what honestly blew my mind was my grandfather who if you ever met was rough around the edges, men play poker, smoke cigars and drink. doesn't understand mental illness in that people should be able to just suck it up, was accepting of me when he would have been the last person on earth I told (thanks mom).
My moms sister called my cousins in for a meeting and made a big deal about the news she was about to tell them. They are both males in their very early 20's. the reaction she got was "that's it? mom its 2015 good for him"
There will always be a generational and location based discrimination during our life times, but our children will grow with a level of acceptance we could only dream of.