Gender abolitionism usually focuses on roles and rigidity surrounding it, not the idea that we will eventually have no actual genders. Gender is biologically real but all the social constructs surrounding it are not. If this is not what you have read, I'm interested in links.
But there is no world in which I am not a woman - but very much a world where I am happy to reject the social constructs built up around womanhood.
I still posit that anyone that can actually change their gender (not realize it and change presentation and potentially roles) was gender fluid in the first place.
My intuition would be floor 2, as it is the lowest floor to the ground that isn't underground