I dunno.
If we open the door up wide (like is expected here) to what a person internally perceives, vs what physically is, you will end up with the "I identify as Neko Cat!" like Reelya lamplit. You will get so many "I identify as $FOO!" as there are possible kinds of $FOO.
For that reason, (since I HATE spurious use of language, and worse-- abuse of language constructs) I would rather not see an infinite number of "I identify as" pronouns, with civil reprisals of "You heinous douche! How DARE you not accept their mythical cat fetish identity!" thrown in when people fail to call them their preferred pronoun.
This is not intended to imply that all gender identities are mythical hoodoo though, so DO NOT go there, I will fucking ignore that noise, so I am shooting that shit down RIGHT NOW. Just that a more stringent requirement than "I identify as" is required. Literally ANYTHING can fill that void. For the sake of being able to communicate effectively, we need to be more demanding in what we consider as the cutoff for when a pronoun is needed.
That is, of course, unless you want to memorize more than the expanded Chinese character set, just to be able to correctly and properly address somebody, based on their exact self-identification, because failure is such a heinous crime that you can expect to lose your job, be stalked on line, and be fined over it. (because that is where this is headed.)