Didn't see the match last night - what was Cummins hitting on the speed gun? Cricinfo commentary was silent on speeds. It's fairly important for Cummins because the 2 things that will get him picked is youth and speed. Articles talk about 150kph for Cummins, but Siddle and Johnson get that number thrown at them occasionally as well, and both only very rarely hit that mark.
And on Steve Smith, yeah the cool thing to do is bag him right now, so let me join in...
It's not his fault he's getting shoved in at #7 and not getting a bowl, the selectors really should be giving him a way to show his quality. Sure it's good experience playing international cricket, but it's also good experience playing Shield cricket around Australia. Long term planning for each player of talent should be a priority for the selectors. I just don't see how Smith gains much from his current usage, send him back to Shield and use M.Marsh as the work experience kid for the next year or 2. Then send Marsh back to Shield and replace him with the next big thing.