A lot of the TRAs (and please note I am talking TRAs here, not confused kids being pushed to transition and people with Gender Dysphoria) seem to revel in doing the forbidden. They, like Jess Bradly, enjoy pushing boundaries and getting away with things. The pushing for law change is their saying "I can do what I like and not only can you not stop me but I will make the whole world afraid to challenge me". They are trying to be the oppressed minority (funnily enough it was Greenday's song I Want To Be A Minority that led me to this thought!)
I'm not explaining what I mean very well but the point I'm trying to make is will the thrill go if the law changes come in? If it's mainstream is it still fun? Some will stay of course but by making transgenderism legitimate and screwing over women will the majority fade away and look for another fad?