I don't think that trans inclusion in these spaces does any of these things, nor do I think 50% of the population feels the way you describe. It's that simple. Women only spaces remain women only spaces even with inclusion of trans women. For all ways that matter socially, trans women are women, and the differences between trans and cis women aren't significant enough to justify exclusion in the broad way you and others desire.
TERF gatekeeping of "female identity" is a fringe position. You are aware of that, right?
You don't believe they happen?
Let's see...
In terms of safety, privacy, and independence, Self-Id of transwomen and forced acceptance into female spaces has resulted in:
- a genitally intact transwoman being allowed into a domestic violence shelter where that person proceeded to masturbate over the sleeping body of her female room mate
- a genitally intact transwoman sexual predator being placed in a female prison ward where she raped female prisoners with her female penis
- middle school and high school swim team members taking turns changing in a much smaller locker room because the genitally intact transwoman's right to be naked in the ladies locker room (regardless of any discomfort it caused) was viewed as more important than the girls right not to have male bodies in their locker room
- Several aestheticians being sued for refusing to wax a transwoman's balls and handle her penis
In terms of undermining progress, transwomen in general want
- to have access to scholarships and grants set aside to address inequities toward females in society
- qualify for female recognitions like "woman of the year" and similar accolades that bring attention to the value of females in the world
- count toward
female quotas set by affirmative action and diversity objectives in areas where females are significantly underrepresented
- re-introducing the concept of "lady brain" which has been used to discriminate against women in science and business for hundreds of years, based on flimsy and immaterial science that has repeatedly shown to be non-determinitive and non-predictive of gender
- to compete against biological females in sports where physiology confers an unassailable advantage
In terms of erasing female identity, trans activists insist:
- sex is a social construct
- biological sex has nothing at all to do with a female identity
- the lived experience of females is unimportant as an aspect of female identity
- that the "essence of womanhood" is something internally felt that defies explanation and cannot be described or elaborated upon, but which overrides the descriptions provided by natal women
- redefined the term "woman" so that it holds no meaning at all
But none of that matters to you, and you don't believe it's a big deal. Females who express those concerns... well, they're just full of hate, right? None of those things are important to "real women" who are, actually, males. It's fine if you dismiss the views of females as not being important. It's fine if you ignore their voices and cast them as "overreacting". They're just typical hysterical girls, right?
It's not important to you if females are endangered and set back... so long as male people make gains.