I sincerely doubt Slipper, Hooper, White, Cooper, Foley, Hodge or Philip will be seriously considered beyond the World Cup. Arnold is likely World Cup and done too. I have more faith in Marika and Kerevi, but outside backs in their 30s playing in Japan will always be tenuous if form slips. Neville's already 34 too.
That's a huge chunk of the 48 (33 + 15 touring with Barbarians & Aus A) that will be in Europe playing and training for RWC, with 8 of those are probably in the final 33.
Regeneration is fine and all, but you'll have 13/14 Tests next year (3 Inbound, 6 RC, 4/5 EOYT) plus Aus A games to bring a whole bunch of minimal cap players up to speed: I don't think abandoning a (however slim you want to portray it) shot at the final given the pool and quarter draws is worth doing so after two games.