Fashion magazines aren't educational charities, they are commercial products which exist to convince people to buy stuff that nobody needs. Cynicism about their motives is a sensible approach to take, because diversity could have been promoted at any point during the last decade or so by the people in charge - but they're only doing it now in an attempt to save face and their sales figures.
Magazines are no longer a dominant force in culture - so now is the time when black people are being allowed to play their part? There's a degree of insult in that. You could say, 'better late than never' - but there's also the sense that the ship is sinking and they've palmed off the captaincy to minorities as it slowly goes down, and the publishers won't be bailing them out.
You've effectively called people in this thread racist, idiotic and out of touch. At what point do you hope to win people over with your words?