Theories continue to swirl about why Olbermann called it quits at MSNBC. I just thought there was some bittersweet irony to this:

With Maddow enjoying both immense popularity inside MSNBC and very strong ratings for her Rachel Maddow Show, Olbermann’s invincibility as the heart and soul of MSNBC’s brand became softer.
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[W]ith the Comcast-related departure of Jeff Zucker, and the rise of Maddow and O’Donnell, the landscape shifted, making an Olbermann exit suddenly seem well-timed.

From Day 1 for Maddow, Olbermann seemed to be an instrumental mentor to her, almost father-figure-ish, with appearances being that Keith was a big reason for Rachel getting her own show on MSNBC. She did so well that the network apparently took comfort in her success, enough for it to become a factor in releasing mentor Keith.

Whatever the reason(s) for Olbermann's exit, one thing is for certain: he will be sorely missed. He not only introduced the viability of liberal or left-leaning broadcasting (in stark contrast to Air America Radio's failure), thus helping to make it possible for Maddow, Shultz and O'Donnell, but Keith delivered with fire, with real heartfelt passion, and came closest to matching toe-to-toe the acidic tone of the right. For those of us who were sick and tired of the wet noodle, weak kneed, overly polite delivery from most figures on the left, he was a welcome and refreshing smack of fresh air.

But for some reason I get the feeling we haven't heard the last from him.... Let's hope not anyway.