The funny part is that you can't figure the answer out for yourself. Diablo and Starcraft are made by the same company as WoW, so there's an occasional bit of news about them. And it's nowhere near the amount of coverage they give for WoW.
And since when did a picture and a blurb equal "plastered all over the front page"?
If by the "the other way around" you mean "MMO-C has occasionally put up news about Starcraft 2 and Diablo 3 for SEVERAL years now", then yeah. Because they are other Blizzard products. But, again, they don't give Starcraft or Diablo anywhere near the attention they give WoW.
What I wonder is what you think it proves.
People have been saying this since the first sign of WoW losing subs. The only thing that's changed is the game they think will overtake WoW.and with the decreased amount of WoW subs, the focus will be different in a few months.