@ Pfitzy - I agree with you comments re why there are perhaps less 'traditional' style 7s in the game ATM. I think its worth noting that these days the whole team is trained to take part in trying to pilfer the ball at the breakdown. Players in other positions have become quite effective at stealing ball. BDP is a good example, but there are many others. With that said I think a guy like Pocock will still be a real asset to the team if he makes the WC. The NH weather will probably mean at least some of the games will become a wet grind. In those circumstances I think I'd lean to Pocock's skills rather than Hoopers.
@ Joe Blow - I agree with your observations regarding Skelton in the scrums. The scrum wasn't as sturdy whilst he was on the paddock, despite his weight advantage. I think it really comes down to the fact that Cheika has been neglecting that area with the tahs. It's badly affecting some of the tahs players, who obviously haven't been spending enough time working on their technique. Benn Robinson and Paddy Ryan have certainly been suffering as a result, and neither will be in a wallabies squad again until they spend some time on improving that area of their game.
McKenzie commented that Robinson missed out because of his poor scrummaging, and whilst many people would say he is out of favour because he is poor around the park I think that's incorrect - McKenzie sees value in having Robinson in the WC squad purely on the basis that he is a strong scrummager. If he doesn't stand out in that area, there are others that are more well rounded (If robinson can improve his technique, I'd go with Slipper, Sio and Robinson as our LHPs for the Cup).
Unfortunately for Skelton and Ryan, they are at a stage in their development when they need to spend a lot of time working on technique otherwise their development will be hampered. It is my one major criticism of Cheika's current set up.