Honestly, I haven't seen an evidence based argument of what the consequences of inclusion of trans. (Not to be confused with full gender integrated restrooms) is.
It's mostly "boys can't shower with girls" and "perverts who we were comfortable having around are boys can now exploit a loophole to get to our girls".
Now if you oppose gender integration, I'm on your side. Not for a morality purpose, just because it's not pragmatic. I don't think boys can shower with girls now that we've made a thing out of it.
But if the concern is perverts, that's just not reasonable. I've made this point before but it's been a non issue in most places.
http://mediamatters.org/research/2014/03/20/15-experts-debunk-right-wing-transgender-bathro/198533
Let me be clear I don't believe in outlawing scholastic sports, church youth groups, and homeschooling, but if I wanted to show you "real life consequences" that have occurred thanks to it, I could write a statistic filled essay there'd be very few places that could say "no incidents" about that, and that is why this is hysteria. Because there are plenty of dangerous things we're comfortable with, we throw up our hands and say "nothing can be done". Except when it's a small group of people that we don't care about who has to pay the price. Then no risk is too small.