I say that this is what happens when you hire authors and artists based on race, gender and sexual orientation, with no regard to ability or their prior track record in comics. Being based in NYC probably has a lot to do with the overall sales slump. NYC is like a cultural outpost of Europe, or wants to be. It has almost nothing to do with the rest of the USA.
The Slashdot comments section at the link is instructive. Comments rated +5 are saying this is what happens when you take popular characters and mangle them to fit an insane SJW agenda, comments rated 0 and -1 are calling them RAAAACIST for saying that.
In a turnaround for DC Comics, they had 7 of the top 10 most shipped titles for 2017. Marvel Comics had the other three.While that looks like a win for DC, consider that the comics market overall in 2017 was 10% smaller than in 2016. DC still sucked, just sucked less than Marvel.