This was the response from a WP flak re: letting go of its talented columnist:

I think the easiest way to put it is that our editors and research teams are constantly reviewing our columns, blogs and other content to make sure we're giving readers the most value when they are on our site while balancing the need to make the most of our resources.

The Post only has so many resources and doesn't think Froomkin's serious and insightful (and popular) online column really fit in any more.

Guess, Froomkin should've been more like these guys, the rising stars from WP: