It's amazing that one little debacle could cause this to happen, but there was a lot of negative light shining on NPR after that. The big problem I see with all this happening, is that it might re-stir the frenzy on cutting funding to public broadcasting after it had died down some. At least the external review showed that there was no foul play involved in the firing.
BTW, it wasn't the CEO that was fired, it was the "top news executive." The CEO still has her job (with a vote of confidence from the board); she just lost her bonus.