Similarly, I think a lot of the casting suggestions for Miranda are far too young. This is not a part for Sherie Rene Scott or Laura Benanti (though he latter would have made a great Emily 10 years ago). I think Janney is would be fun, but she has a hit sitcom and doubt she would commit to this.
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.