Yes, that's the logical end result now (with secure units in those and careful care).
Because how can you judge a "real" transwoman? You can't anymore. That's how it used to work.
Right now any man who says it (like "Karen"), is absolutely equal in their rights to someone who's had surgery and years of a dedicated quiet life. The number of reports about this is increasing. More men will take the piss.
So why should women's units have to be rebuilt and remodelled to accommodate the increasing number of men clearly trolling the system?
You might as well create unisex prisons (which might indeed be the future goal, like everything else).
It's shit and it's not what I'd personally want for a "real" transsexual, but if the choice is "anyone who says he's a woman" and "no men", I can only think the latter is best.