Who says the editors in question (Walrus; Writers Union Magazine) can "afford to quit"?  

If they are solidly "middle class" in earning power, they'd be very fortunate.  Chances are, closer to the "working poor."  I respect them both for their stances, respect their decisions to quit, especially the Walrus editor, who says, "I noticed that I was starting to censor myself. And that’s the sign when any writer has to move on."  Good reason; sadly. 

Here's the particularly chilling bit, one poet says, "“I hope the weight, the solidarity of these retractions will influence the thinking process around finding Kay’s successor.”

Yeah, maybe.  Possibly.  Unfortunately.