Dear CaptainOveur,
Not to sound like a collaborator, but am I the only one who reads the memo differently. I think the point they are making is that 10-12 months down the line, they will have chipped away the people they don't want or need, so by that time they won't need to sack anyone, hence the use of his favourite phrase "natural attrition".
First things first, today's exodus frenzy has nothing to do with
natural attrition it's a serious case of abandon ship. Secondly and more importantly natural (or otherwise) attrition does not guarrantee you get rid of "the one's you want". In fact quite the opposite, the good one's get jobs while the bad one's rejection.
The bottom line?
Scores will resign including the author