My concern is two fold. One, for transgender persons, who will fear the reaction they will get every time they enter the restroom. And second, basically any person can claim to be of the opposite gender, and walk in to fulfill a sexual fantasy, even a mild one.
I simply don't understand what is the huge effort in using the restroom appropriate to your physical gender, and simply avoid the psychological conflict with the rest of the population. Especially considering the high rates of mental illness and suicidal thoughts and attempts among transgender persons. This, for now, will only add to that. Do they really need to be subjects in a future study that will show the impact of such laws? Or used as ammunition for 'transphobia' accusations in the media or elsewhere? Will the victims of the first line in the war of imposing a policy in the society be really worth it, especially if that increases their chances of committing suicide?