That does not look like an intimidating side.
Cummins should be the best of your bowlers, but he is never fit.
The batting looks likely to collapses and the fact that Vogues or S Marsh get in there, suggests that the Sheffield Shield is producing even less batsman than our County Championship.
Bancroft and Lynn have played well in India on the A series, but neither have genuinely set the world alight in Shield.
Looking at last years Shield stats, the top performing batsmen were all either a) retired from international cricket, b) already playing for Australia, or c) overseas players. With Rogers and Clarke retiring, S. Marsh doing his best to prove he's unable to handle test cricket, and Voges not stamping his authority on his place, Aus are going to need new players to step up. But other than Lynn and Bancroft, there's no one in the Shield sticking their hand up. Khawaja has been tried and failed (but I wouldn't be surprised if he returns as the new opener, assuming the selectors realise what everyone else has known about S Marsh forever).
Shield is littered with high-30's averages amongst the younger generation who are meant to be the backbone of the future Aussie batting line up.
Re: Cummins - apparently his action has been 'fixed' and he shouldn't be so injury prone now. We'll see. I also know that he, and a couple of others, were the victims of some poor footwear choices - bowling boots were found to be at fault for a spate of foot injuries for up-and-coming Aussie pacers.
Edit: Also, being fair to Voges. The guys is the classic case of being picked too late. All the time that Australia spent mucking around with Khawaja, Doolan, S. Marsh, and others besides - Voges was the stand out Shield player. Him and D. Hussey both got left out in the cold during their best years, while the selectors went looking for the next young gun (or picked never-was' like Cowan instead of grabbing Rogers immediately).