David Gregory was let go from Meet the Press because...

The ratings sucked. He is a partisan hack who is firmly entrenched on the side of Progressivism. And as NBC's sob sister channel MSNBC knows for fact, low ratings are the reward for siding with an ideology rejected by the majority of the American people.

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Meet the Press Gets a Facelift

For unicorns, which rarely bother tuning in Sunday morning to watch Meet the Press, the news of MTP host David Gregory's firing is as insignificant as the show's ratings. Chuck Todd, David Gregory's named replacement, doesn't spark much enthusiasm either. 

Honored and humbled to be in the company of great MTP moderators, including David, Tom and of course Tim. All three taught me so much.
— Chuck Todd (@chucktodd) August 15, 2014

I leave NBC as I came - humbled and grateful. I love journalism and serving as moderator of MTP was the highest honor there is . (1 of 2)
— David Gregory (@davidgregory) August 14, 2014

(2 of 2) I have great respect for my colleagues at NBC News and wish them all well. To the viewers, I say thank you.
— David Gregory (@davidgregory) August 14, 2014

Well that seemed nice and doesn't quite fit the image of Gregory as a known, classless jerk. Michelle Malkin's comparison of Gregory to his predecessor, Tim Russert, is quite telling. 

Gregory’s predecessor, Tim Russert, was highly respected on both sides of the political aisle . . .  Gregory is the anti-Russert. His boorish behavior around D.C. is legendary — from his juvenile tantrums with the Bush press staff to his drunken radio appearances to his diva snit fits with innocent bystanders while filming news segments. One of the most telling and notorious anecdotes involves Russert himself, who reportedly reprimanded Gregory in 2008 for going ballistic on a poor waitress while the two TV stars dined at a D.C. restaurant. But “Gregory still treats most of … the newsroom like s**t,” an insider told the website Jossip. “Amazing how NBC cares more about food servers than about the people who have to deal with Gregory’s arrogance every day.”