I think the two variables are what level of rotation Cheika uses over the RC and how many newbies, if any, he runs with.
Regardless of last results, I find it very unlikely that Cheika is going to give consideration to more than 3-4 new players and/or go for large scale upgrades in the involvement of fringe players. Players like Mafi, Rangi, HJH (Harry Johnson-Holmes), Philip, Naisarani, Valetini, McCaffrey, Jones, Powell, Lealiifano, Cooper, Hunt, Banks & Pulu are all impacted by this (and no doubt a few I’ve forgotten). Meanwhile guys like Simmons, Coleman, Hanigan, Dempsey, LSL (Lukhan Salakaia-Loto), Phipps, Foley, Beale, DHP & Maddocks all May benefit.
On the one hand, doing the same thing and expecting a different result is idiocy. On the other experience performs well at World Cups. Bringing in a whole bunch of rookies, or guys with minimal caps is unlikely.
Here are the guys I expect to see feature in the RC
Props - Slipper, Sio, Ala'alatoa, Tupou, Kepu (doubt there is too much genuine conjecture there)
Hooker - Fainga’a, TPN, Ulese (I would like to see Mafi - but I think Cheika will go with Ulese who has at least had some test experience)
Locks - Rodda, Arnold, Philip & Simmons (sorry BR - I know you’ll disagree, but I don’t think both Coleman & Simmons will get dumped)
Back row - Hooper, Nasirani, Salakai-Loto, either Samu or Pocock & either Valetini or Dempsey
Halves - Genia, Powell, Phipps or White
10s - Foley & Lealiifano
Centres - Kerevi, Kuridrani
Wing/Fullback - Beale & Hodge (both also covering centre), DHP, Koroibete, Banks, Maddocks & maybe Pulu
Who did I miss?