"I dunno, do we need a recording of every revival?"
The proper theater fanatic answer is "Yes".
OK, I have to admit that I want this out of pure greed.
My sister and I did my first ever trip to New York/Broadway this year from Washington State (shocking to all my co-workers, because all I ever talk about is theater with them), and the three shows that we went to see are "A Little Night Music" (has a recording), "Promises, Promises" (will have a recording), and "La Cage aux Folles" (no recording as of now).
The person running the "La Cage" twitter feed even commented on my listening to the Japanese cast recording of "La Cage".
Xanadu! Can't cry on cue!