Development began under the title Anna and the Snow Queen, but development stalled until 2011.
Disney had plans to usher in a new age of hand-drawn animation, beginning with The Princess and the Frog.
When that film underperformed at the box office, Frozen was retooled to be a computer animated movie, similar to Disney's earlier success Tangled.
The move clearly paid off, as Frozen was an unbridled success. But one has to wonder, wouldn't it have been successful as a hand-drawn cartoon? Concept art exists of what the film might've looked like, and it's lovely.
Even if it wouldn't gross over a billion dollars, it's hard to imagine a traditionally animated Frozen not being a hit.
Just imagine—there's another universe out there in which a hand-drawn Frozen gave way to a new era of classic cartoons.