I know it's not a big deal. A lot of shit Americans view as big deals aren't. But it's still an interesting concept I think? Something other than male or female? What are you?
I'm cis-gendered female, bisexual, and don't think third gender is a big deal. I can understand how it could be complicated when it comes to identification paperwork. If it becomes a common option it'll be something along the lines of: when you're 18 you can change your identification to "NonBinary", providing you've filed it with [insert some government organization here].
When I really think about a purpose behind having gender (or sex) on regular identification, the reason falls short. My ID has my picture and my height (no weight in Florida, but it did in Arizona). They wouldn't really use the SEX: F to determine if they thought I could overpower them, or outrun them or anything. It doesn't seem to be on there to assist EMT's, because if they're doing something and my sex is important they'll be eyeballing it anyway. Same with hospitals...if I'm unconscious and need a catheter, they'll be eyeballing it anyway. Hmm. What good IS the gender on my ID....?