The thing is, even if Maddox had never declined, his edgy humor has a shelf life. His act is basically saying to the audience "I'm so fucking awesome, everyone else fucking sucks compared to me." To which his target audience (late teen/early 20s males) says "Yeah, everything DOES fucking suck! You rock, man, and I can tell you that, 'cuz I don't suck!" And then Maddox says "LOL, no, you suck too."
You can't maintain an audience forever when you hold outright contempt for them, even if you're playing a character and even if you're just putting on a show. Once the shock value wears off, people are going to tune out if you don't respect them and take them seriously. Even Howard Goddamn Stern knows this. That's all Maddox had, and this was the natural course of events. Like has been said before, I'm surprised it took this long.
Turning SJW was a neat twist, though. All it does is undermine what little notoriety this guy once had.