Actually, I'd tend to call this a victory by the SJW types, more than the transgenders. They don't want to be singled out as anything but their chosen gender - a MtF transsexual wants to be female dammit, it's "She Her Ms" etc...
"ze hir" and such are for an even rarer and pissier crowd that aren't actually transgender/sexual. They're generally not on hormones, not looking to afford surgery, etc... They just want to be special, in my opinion.