We are creatures of habit and repetition, so we will never outgrow the trope qua trope. Nor should we want to. Novelty is predicated on predictability. We love burgers because we know essentially what to expect, but then hey! The bun is now two grilled cheese sandwiches, and we love that, too. Without a platonic ideal of BURGER, however the grilled-cheese-burger-thing would just be a pile of random foodstuffs. So let the trope live on, but let it be pulled apart, examined, and occasionally stood on its head. Let the manic pixie dream girl learn to put on some shoes and hold down a fucking job, and let her do it as the defining force in her own life for once, not as the Tinkerbell to our hero’s Peter Pan.