This.
I mean, it has been obvious for, I don't know, 5 or 6 years. The only reason there's no need to turn everything into a Marvel vs DC thing again is that at this point it would be like hitting a man when he's down. I don't know how many people realize that Feige hasn't even started to make movies or series about the Fantastic Four or the mutants, and there so many potential franchises about them that in 10 years or so I am not even sure people will remember that DC exists. Heck, they are making a full series about Agatha Harkness for God's sake.
By the way, it's not that a Dwayne Johnson Black Adam movie is a real response to it. The movie will probably make a lot of money, since every stinker with the Rock in it makes a lot of money, apparently. But rather than a DC movie it is a the Rock movie in which he plays a character who incidentally resembles a DC comics hero (or anti-hero, whatever).