I won’t say that he declined; that would imply that he was actually some kind of serious force in the field of political commentary. But he has certainly fallen, and apologies aside, television personalities have been fired for less egregious violations than Schultz is responsible for.
As the first link makes clear, Schultz has a history of making utterly unacceptable remarks. There is no reason whatsoever to believe that in the future, he will issue an intemperate comment similar to his insult of Laura Ingraham, or one similar to his threat to “torch” MSNBC if he did not get sufficient amounts of airtime. Quite obviously, he is a lout and a loudmouth, and if MSNBC had any care or concern regarding its reputation, they would have dispensed with a suspension, and would have fired him.