I remember reading decades ago that CDs were thought to occur at about the rate of between one in a thousand to one in ten thousand. Now if that were the case, then I could see transgenderism falling from the limelight at some point. But honestly, it seem this occurs at about one in several hundred.
Regardless of the numbers, there are a lot more CDs TGs and TSs out there than the public imagined. And given the openness of gender exploration today, a lot more people are experimenting and finding out they do not fit into the bi-polar gender scheme.
As gay rights and awareness increase, so does gender variation awareness increase.
To answer the question- it is new, and it will cause controversy for years to come. The "fad" of course is a media fad. The sensationalism will last a few more years, then the reporting of TG rights and struggles will fade in this country as we settle down. Then it gets to be addressed in other cultures- middle east, etc.
Ultimately, it will be like a facet of global culture- such as how asian or middle-eastern cultures meld with western. But instead of being geographically different, it is a personality culture that was basically in a hidden dimension throughout all geographically defined cultures.
It is integrating faster than I thought it would, and I am personally really happy to be witnessing this change in society. there will be ups and downs for sure- but as a kid growing up in the 70's, i would not have thought it possible to change so quickly.
Global communication and socialization is the advocate here: people talking like right here and now- communicating to people all over.
The media started it, but it has a chokepoint of the editors/owners/advertisers. Social media does not have that, and the commercial media will be strongly influenced by this.
It is pretty neat to watch it happen.