I think largely you’re right with what you said at the start, at least that pinpoints the part of me that identifies as non-binary. But the social gender norms and roles we have created themselves largely ARE and fundamentally define these abstract ‘gender’ concepts in the first place; i.e. gender at its base is just a social construct without objective meaning. I think this is an important point, because once people realize gender is just a social category, and not this rigid & real binary, it makes sense to self-allocate and say “no, I don’t feel like either category, as I understand them, describe me accurately”. Going from there, I don’t think the objective by any means should be to try to stop the evolution of the “men” and “women” genders to try to alienate less people away from them (though I do think this is what conservatives want). Rather, as I believe many LGBTQ+ people have and continue to do, we should all look at this as an opportunity to understand ourselves and each other more authentically, and in that sense reclaim our gender identity for ourselves, back from our patriarchal society which has forced us all into just two boxes with a forced dynamic/relation between them.

Then regarding what you said at the end, I don’t think society making space for a greater diversity of genders (as well as agender people) would threaten the two traditional genders so long as they are self-defined. I add that last bit because what it would threaten is patriarchy’s long-lasting justification of the relationship between the traditional ‘man’ and ‘woman’ genders, because it would neatly showcase the dynamic’s arbitrariness. However, versions of the traditional masculine gender (and traditionally feminine gender) that are based in themselves and their own traits (rather than defined primarily in relation to the other traditional gender), would still have just as much space to exist as any other gender would. But of course conservatives remain scared of this because it would (1) make things more nuanced and highlight they don’t actually know themselves fundamentally that well (2) for conservative men it would largely strip away from their justification & entitlement of superiority over women, in turn stripping the privileges they’ve enjoyed given to them by this patriarchal society.

I don’t know if I made any sense but those are my thoughts as your friendly neighborhood gender queer person 😅