Jeff Foust asks, with regard to Griffin's reorganization:

At what point does the standard reorganization of officials during a change of leadership become something more like a purge?

I'm not sure exactly where that point is, but it seems pretty clear to me from this WaPo article that, though they don't use the word, we're well beyond it.

As I've said before, Dr. Griffin is either going to be a spectacular success, or a spectacular failure, but either way, he's going to do it his way. As the article points out, he's been thinking about these issues for a long time. If I were in his position, I'd do a pretty thorough housecleaning as well, but I wouldn't necessarily bring in all of the same people that he will.

[Update in the afternoon]

Via Keith Cowing, here's a Slashdot discussion of this.

[Another update at 3 PM]

Thomas James says that Griffin is being Machiavellian. He means that in a good way, of course.