I agree - great article. I think this point in particular is important:
The law may be able to compel grudging toleration but it can never guarantee acceptance.
It strikes me that there's a clear difference between gay rights legislation over the past 20 years (the repeal of Section 28 and the introduction of same sex marriage) and the proposed trans rights legislation. The difference is that the idea of marriage had already been redefined in society: the idea of heterosexual marriage as the foundation of a stable society was passé long before same sex marriage was recognised. This has little to do with gay rights: from the 1970s onwards heterosexual couples were increasingly living in unwedded bliss. Marriage became a choice rather than an obligation.
The same cannot be said for the idea of women and men as categories: sex has not been redefined in the social imagination the way marriage was. Even the popular idea that women are now legally and socially equal to men hasn't reconceived 'men' and 'women' as interchangeable or equivalent.
The heterosexual majority had already abandoned marriage as necessary before gay rights activism for same sex marriage. The heterosexual majority has made no such manoeuvre with respect to sex class - and recognition of gender identity isn't quite the same thing.
So yes, we do need legislation that protects trans people from discrimination, but self-ID probably won't lead to acceptance. I think Debbie Hayton is absolutely right.