I would think the only players certain to retain their places would be Broad, Stokes, Cook(but for how long) Bell, possibly Pieterson, with Ballance and Root getting further chances and that's about it.
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Agree with most of your post, Diatribe, but disagree about Cook. You're spot-on about Jimmy, Onions would be a better bet now; and time to move onto a new, proper keeper, maybe Davies or Butler?
Re test selection, I'll go a bit further, .
The only players whose performances in Aus merit them being in next year's first test team are Stokes & Broad. Cook will be there so long as he doesn't resign the captaincy. Everyone else should be told they've got to produce the goods in the county game, big time, if they want to be selected.
If guys like Bell, KP, Jimmy, Monty etc can't get a hatful of runs / wickets against county opposition, let's give a chance to those who can.