Colbert got fired because he was too good at his job (whether you like his show or not).
It's a badge of honor to get kicked off TV because a President pressured Big Media Executives who needed Federal approval for a pending business deal.
George Carlin would be over the moon to be fired like that. As a provocateur, the ultimate success is to provoke the leader of the Free World to personally intervene and use the power of his Office to get you fired.
As a performer, he's probably going through withdrawl of not having instance feedback from an audience. He's a performer in search of his next stage.
He should spend the Summer visiting with other comedic figures - David Letterman, Dave Chappelle, Seinfeld, Larry David, and others who have been in the business long enough to have been fired a few times and made comebacks.