At the moment you'd be mad to move away from Siddle, Pattinson and Hilfenhaus. That was one of the best bowling performances I have seen in years, although it was on a deck that offered them a bit. The key to it was discipline- good line and length bowling to well-set fields. Stopped giving away easy singles and boundaries and the wickets came. And, surprise surprise, we have gone ahead in leaps and bounds without Mitch Johnson. I think his test career is on the rocks. We are executing plans that simply weren't possible when he was there, bowling a combination of unplayable deliveries (which got rarer and rarer) and complete shit (which got more and more frequent).
But I'm sure one of them will go down injured soon. That will open the door for Harris, who is a great bowler. Then Cutting, Copeland, Starc, Hazlewood. We are well-stocked for quicks. Now we just need our batsmen to score some fucking RUNS.