I see two possibilities here:
1) We're just out of sync with millions of CTC listeners, or...
2) CTC succeeds in spite of an annoyingly incompetent host.
Sure, there are people who love George. He's got a soothing voice, he's familiar, and he's usually cheery or upbeat (well, except when he's talking about how we're powerless because the world is actually run by a few shadowy, all-powerful corporations' or how Major Fraud "Killshot" Dames is never wrong; or how Planet X or Nibiru is going to reappear at any moment and destroy life on earth). We forget that Simple George had AB's seal of approval. He was clearly Art's chosen successor (whether or not he really was - Art knew it was important for the success of the show that he back George). That means a lot. For example, if, say, George Knapp had gotten the gig, I don't see George coming in as a guest host and people clamoring for him to be made permanent. Art's blessing was a huge advantage. Those loyal to AB tried hard to like George, and it worked in a lot of cases.
Plus George doesn't threaten anyone intellectually. Not many people think "I don't like George Noory because he's too smart for me". This might happen with someone truly intelligent, like George Knapp, or someone who constantly tries to convince us he's intelligent, like Ian Punnett. But everyone knows George is dumb as a flat rock. That makes us comfortable with him.
Still, I think it's the format that is the reason for the success of the show. George is just something we put up with to get to listen to what the guest has to say. There's really nothing like it on national radio, an every-night "alternative" format. Now, the format isn't foolproof: a truly terrible host could kill it. But until real competition comes along, George isn't in any trouble.
Unfortunately, it looks like only George's misbehavior can stop his evil reign. So I think we need a plan, and a fund: "The Alliance To Keep George Noory In Booze, Hookers And Crack". How sweet it would be: an on-air blow-up when Drunk George locks himself in the control room, where he sucks on the pipe as he does an in-studio interview with a hooker about what they've done in the last 48 hours.
We could make that happen. If we just have the will, and enough money, we can make the dream come true. I volunteer to be Treasurer.