Obviously not that many, he had some of the worst ratings of any cable program.
If memory serves he was the top-rated talking head (or choose another part of the anatomy if you wish) at MSNBC. Even so, I'd wager that he was rated below even the least-popular shows at Fox.
I'll be curious to see who, if anyone, hires him. CNN, in spite of their questionable politics, does strive toward civility and credibility. That leaves Olby out. Fox's bread and butter is balance and credibility so he certainly wouldn't make the cut there.
But would he leave MSNBC without having somewhere else to go? He'll turn up somewhere, but I've no idea who would be interested in him.