I don't want to trivialize the issue: making money is not easy, but the guy over-plays the victim card.
He seems to be a successful artist. He quits and it's all a fault of other people, who don't pay him as much as he deserves.
Again, not to trivialize the issue, but an artist with a lot of fans should be able to find a way to make money.
Did he try to follow the steps of many cartoonists that make decent money doing daily cartoons on the web, like theotmealguy?
Did he try to create anything outside of work-for-hire arrangement that he entered (willingly, as a consenting adult) into with Disney?
No evidence of that.
According to him, it's just the system conspires against poor artist.
According to me, he's just a lousy businessman who lacks awareness of his own shortcomings and oblivious to many ways he could have made money with his art. Instead he chose a safe route of employment and as an adult he should understand that it also usually comes with limited upside.
If he wanted a bigger upside, he should have taken more risks.