The point was really that web comic people diversified. Look at penny-arcade, Scott Kurtz, randal Monroe, Ryan west (I mean North), the oatmeal, kris straub. Questionable content is almost traditional by their standards, making one product, one way and selling it. All the other talent in comics have branched out, using that art to make more diverse things than a formula driven 3-panel comic. EDIT: Also, all those people do make a good living, heck, penny-arcade has a staff of like 7 people, a multi-million dollar charity and an international expo, they are doing pretty good. I can name more people living off web-comics than I ever could for syndication. EDIT: Ryan North, Ha!
Ryan North, for example, drummed up a lot of sales for his anthology Machine of Death, it's sequel, and his recent Hamlet book just because people are fans of his writing. He's got enough popularity that he's writing now for the Adventure Time print comic. Most of the time, people are interested in his stuff because, hey, it's by "the guy that writes Dinosaur Comics". KC Green writes the Regular Show one. Kate Beaton did some work for Marvel. Anthony Clark has done covers for Marvel, and I'm sure there's a few more examples that are slipping my mind. They've built themselves a loyal fanbase who will provide interest in their other endeavors.