I can see peak trans becoming mainstream very soon.
I hope so.
If, as you say, TW are now appropriating the term "cis" then the motives of transactivists could not be more transparent, as it is not about their own identity, but that of others, that they are focused on.
First, they appropriate the term woman. Fine. (actually, it's not, but still, go with it). Those women to whom the woman applies reluctantly accept their rebranding to "cis-woman". But that term then excludes some women, who are not cis, so the definition of cis is changed to include them. And so it goes on.
The armchair psychologist in me is wondering whether the underlying motives are that transactivists are in pursuit of something that doesn't exist. They transitioned, and became trans, but that didn't give them what they were pursuing, so they insist that becoming a "woman" will satisfy them. But that hasn't satisfied them either, so now they are attempting to become "cis-women". Boy, are they in for a shock when they finally realise that this is as good as it gets! Whatever utopia they think womanhood will bring, it is still alluding them, because, as any woman could tell them, "being a woman ain't all that good"!
If this wasn't related to gender/sex, but instead applied to geographical locations, it would be considered an "occupation".
control by a certain ruling power (transwomen) over a territory (women) which is not under the formal sovereignty of that entity (transwomen), without the volition of the actual sovereign (women).