If we're talking about globally maybe (although it's kind of a mistake to see it as every country going first gay, then trans. Some very anti-gay countries can be shockingly progressive on this issue.), but I don't see it in America.

It may look like this is just becoming an issue, but like most civil rights issues it's one that has been around since the 60s or so and just now getting around to its turn in the spotlight. The thing is, we're already closer to accepting it as a collective than we were with gay marriage in 2003. When Massachusetts became the first state to recognize same-sex marriage in '03, only about a quarter of the country supported it. That basically flipped in a little over a decade.

Look at opinion polls for North Carolina's HB2. It can be kind of murky depending on how you word the question, but it was more or less 50/50. And that's the population in general, not just Millennials. Sure there will always be those who never accept it and issues left unresolved, but I doubt it'll be that long until most of the main goals of advocates are realized.