the rachel dolezal reverse-passing case is pretty interesting. i see why it's a problem, especially in a situation where one might benefit from affirmative action, or have a job that is partly race-based. but...there just isn't any such thing as race either, right? a fungible social fact. so, why isn't rachel dolezal, for example, trans? maybe she can be the caitlin jenner of race. maybe people's surface doesn't always represent "who they feel like deep inside" etc. now, both in caitlin's and rachel's case, the idea of being something deep inside presupposes the duality. but keep migrating about through genders and races and pretty soon you've thrown the existence and nature of such identites into fundamental chaos, or even made yourself impossible, or problematized the notion of being male or female, black or white, at the surface or deep inside.
if your gender is a matter of how you self-identify, for example, then why not your race? if we should use the pronouns for someone that they declare or prefer (and i think we should), then why not treat people racially on the same sort of grounds? is your problem that people might reap advantages from being black? boy i don't even know where to start on the ironies.
now the sudden explosion of trans identity seems progressive, etc. but then again, many forms and moments of feminism presuppose the essentiality of gender identities. that includes affirmative action, or for example the sheer assertion that women make less money than men, and a million other things. and likewise with race: all the affirmative action and attempts to uplift the black community and black pride and so on presuppose that there is such a thing as race and that it is fundamental to identity. but what happens when - potentially in an apparently progressive way - these categories liquify completely, and all of that becomes impossible? i'd say the political reconfigurations that this entails are completely wild and unpredictable. progressive politics, no less than reactionary politics, presupposes the identities as fundamental realities. watcha gonna do?
one thing i'd predict: people are going to be more comfortable with gender-trans identities than race-trans identities. this is ironic because i'd say race is even more problematic than gender as an objective or biological fact, even more obviously 'socially constructed'. it has been liquid from the get-go, with a million variations, complications, and every possible mix. people have been passing one way or another or enacting the other, or defining themselves or one another as octaroons or whatever since they invented the concepts. but maybe for that very reason, the boundaries require extreme policing.
of course, if racial identities were to dissolve, that could be a terrible problem and a terrible loss. for example - and this would be typical of the history in various ways - it could just sort of mean that everyone gets to be a white person. you can't have black culture in a society with no or thousands of races, and that would be an astonishing cultural loss (i'd not mourn the death of white culture the same way at all, e.g.). on the other hand it might be a wild multiplicitous love-in, an opening up of a milllion now-inconceivable possibilities. race has been a nightmare too, hasn't it?