I don't think any play revival has a lock on their category in the way that Hello, Dolly! does for the musical side. There have been several good or very good play revivals this year, but I don't think there's one that is head and shoulders above the other.
I'm curious to read the reviews of this- I've heard differing opinions from friends I know who've seen it.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.