At first, I was a bit irked by Touko's monologuing at at the end of the play: even though I know how theater works, I still think there must have been a subtler way to show the protagonist's character development there, especially given how awesome the author (both in- and out-of-universe) has used Touko's mad acting skills in the previous acts. Then it hit me that Koyomi must have dropped the anvil on purpose, just to force Touko to say those words out loud, for her own good.
I also agree with previous comments that the play was not the climax, but the setup for the climax. While Touko is riding the euphoria right now, I expect a crash to come pretty soon, when she actually gives it some thought what she wants to do now. Still, I would love to see Yuu become the focal character next instead...