This article seems off to me. DC has made a lot of attempts in the last ten years to diversify its cast. The new Atom, Blue Beetle, and Firestorm are all examples of this. The new 52 started with a number of titles with non-white male leads. Static Shock, Blue Beetle, Batwing, Batwoman, Mister Terrific, and VooDoo were all examples of this. How many of these are still around?
Besides, John Stewart has gotten a lot more attention this past decade than he ever had before, and five earth lanterns is a little much. If DC has to kill off one of them in favor of keeping Simon Baz, which Lantern is it going to be--Guy? Kyle?--Hal again?