The Laughing Place has an interesting blurb and clip from Zachary Levi concerning how Frozen was almost did make it to screen.
From the article:
Zachary Levi, the voice of Flynn in Tangled, recently sat down to talk to Entertainment Tonight about the new Tangled TV series and the possibility of a Chuck reunion.
But perhaps the most interesting thing he said was he was told by John Lasseter, the Chief Creative Officer for all of Disney animation, that Tangled would be Disney’s last fairy tale movie.
“He said, ‘Alright guys, this is it. This is the last one,’” the 35-year-old actor recalled Lasseter saying. “Then he made Tangled and we did really well and it was enough to buoy that for them to go and make Frozen.”
“So I will say to the Frozen people, ‘You’re welcome. You are welcome,’” Levi joked.
You can read the entire thing here.