Jay Lerner-Z said: "Is there any GOOD reason for this not to happen?
What… they’re above it now they’re Hollywood stars?
They both have stage experience, both claim to love the roles, and live performance is their first true calling. It makes sense.
Of course they’d have to re-learn the parts in a completely different way, but they are capable of that."
Because it would take them out of commission for a number of months when they both have other commitments and it's full awards swing for Wicked, doing any post-production finishing on Part 2 and starting to kick off that press tour.
And it's not just re-learning their parts- it's learning an entire production. Blocking, choreography, quick changes, makeup, scene changes, hitting cues, etc. You can't just hop from a film to a stage production. It all takes time, time that celebrities of this level simply often do not have unless it has been carefully scheduled a long time in advance.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."