You can post a notice and give the show a workweek before it closes.
The notice can be taken down half a workweek (4 perfs) before the posted notice would take effect without penalty.
Some shows have spent most of their run with a notice of some sort posted and then taken down and replaced by another for the following week.
All Shook Up has a potential gross of about a mil a week so 500 grand per is not all that good. It doesn't matter diddly squat how many people are in the audience. It matters what those people paid to get in the theatre. Remember those 2nd balcony tix are $19.50 each and they sell like a house afire. However they sell to an entirely different audience than the ones dropping a Century Note per seat downstairs. Discounts are rampant on the show.
On the other hand there is no show with an immediate need of a theatre. Nothing is in rehearsal without a theatre. I bet they want this to play through New Years. Let's see if it does. This would give the powers-that-be time to start booking a tour.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher
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