No. There are many situations where single sex provision is mandated.
An employer must provide single sex toilets. If changing rooms are needed, they must be single sex. In both cases, unisex provision is only allowed if it takes the form of a lockable room for one person to use at a time. There is no getting round that. This provision will now have to be single biological sex.
There are many other situations where regulations or licence conditions mandate single sex provision. Again, this will now have to be single biological sex.
If the circumstances that permit single sex provision apply, most organisations and businesses will still need to continue with single sex provision. Moving to mixed sex either won't be practical or will mean no-one will want to use their services.
There may be some organisations and businesses that move to unisex provision for some things, but I expect that most will stick with single sex provision and, hopefully, most will realise that now means single biological sex.