Yeah McKay's been given a bad rap. He played that unimpressive Test at Perth and burst that bubble of hopefulness that had been surrounding him. So he could be getting himself in contention for that 4th quick bowler for the first Test, along with Siddle, Harris and Bollinger (although if Dougie's fit I imagine he's locked in as the #3).
And for the World Cup I think he should go ahead of Siddle as the 5th quick bowler. Johnson, Bollinger, Harris, Lee and Tait are ahead, but one of them will surely have an injury by then.