Wicked was a single Broadway musical that became two films, with each one roughly representing one act of the hit stage show. That risky creative move turned out to be a major financial windfall for Universal, who got two sell the same property twice — and got to sell Wicked- themed merchandise to fans for two holiday seasons in a row.
But now they’ve exhausted their source material. At least on the stage; Wicked was loosely based on a novel by Gregory Maguire, who wrote several sequels to his book — all of which were based on the original Wizard of Oz stories, of course. So while there isn’t an obvious way to continue Wicked beyond the new Wicked: For Good , that might not matter, given how enormously, uh, popular the films have been for Universal. (Sorry.)
Indeed,

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