At some point the coaching staff has to come into question too, they're clearly a talented bunch of players so why are they so prone to capitulation in the face of adversity? They need the coaches to strengthen their resolve, at international level there's only so much technical work the coaches can do (the players are clearly good enough to have got this far) so why aren't they helping improve the mental side of the game? This is where having Ramps as batting coach makes very little sense, his technique and ability were top drawer but he lost it mentally at the top level, they need someone like Collingwood in there, yeah his technique wasn't great but he had the mental capacity to get the best out of what he had and the grit to take it to the opposition, that's what the current team needs to learn, Stokes, Bairstow, Ali etc. are obviously very good players and will score you hatfuls of runs when they're on top but when the going gets tough there's only really Cook and to a lesser extent Root capable of battling through.
On a selection note if Stoneman is coming in then my XI would be:
Cook
Stoneman
Jennings
Root
Ballance
Stokes
Bairstow
Ali
Broad
Wood
Anderson