Good post - although I would argue that Emery could have been and should have been stronger in getting rid of the players he didn't want. If he couldn't or wouldn't do that then he wasn't the manager we needed.
But your analysis is spot on, this squad has talented players (other than in defence) but it needs to be cleansed of those who aren't good enough and/or lack the character we need. The next manager has to be strong enough to do it.