don't you need to think "ok, if our game plan works, what will the other team try to adjust to stop us and how will we then respond to that?" Kind of like a good debater would be able to anticipate how an opponent tries to deconstruct his argument and he then has additional prepared "ammo" to respond in turn with?

After a great 1st half, the coaches should've spent half time reviewing a pre-planned set of "this is how we'll adjust to counter the adjustments they might make" so they could enact it in the second half.