This feels like it needs a short history lesson.
Transgender people always existed, with varying level of recognition in the law depending on time and space, from annihilation to just another person. We managed to exist in either of those environments.
In UK, even in depth of section 28, we continued to exist and live in out transition just fine, the only variable is amount of harassment we have to endure that's endorsed by the law.
And you think that completely unenforceable law (under which it's impossible to prove that you are cis btw), with no punitive measures, is going to somehow make transgender people to decide "yep, you right, we will give in to the few loud transphobes and stop existing as ourselves?"
You live in lala land, not reality, if you think that.
And the law on top of everything is temporary, the reading you want of FWS puts us entirely in the same position which resulted in Goodwin, and creation of trans rights. Except now there is even more precedence in ECHR for us.
See ya in the loos that apparently bother you so much.