The treatment of Nick Compton was an absolute ****ing disgrace. The English selectors should be shot for the way they treated him (and the opening spot more generally) since Strauss retired. They've created a wheel of mediocrity these days, not because all the options suck (Compton would have been good, and Robson/Lees is the long-term answer IMO), but because they've taken an ultra-short term 'two bad Tests and you're out' mentality and never given anyone a chance to settle into that role.
And that's compounded by the second opener having to be brilliant because Cook is a shadow of his former self. If you aren't averaging 50 immediately, you're getting Fulton/Rutherford results batting alongside Cook and the selectors aren't going to accept that. Meanwhile Cook is undroppable, so it's always #NotCooksFault. So Compton gets thrown out after a series win, two (admittedly horrid) Tests removed from his very, very good tour to NZ. Root comes up, then goes back down to the middle order spot because they selected Jonny ****ing Bairstow in his place. Carberry is in-and-out as a casualty of Johnson's 5-0. Then Robson, the great white hope, makes his maiden ton and is dumped a couple of matches later. So now we've got Trott, because they wanted to force Trott into the line-up somehow. Then they'll go Lyth, and he'll average 30-35 in 10 Tests and be dropped after a couple of bad innings. Same thing for Lees unless he dominates from the start.
Cook's created a wheel and pushed it down a hill. Now it's rolling uncontrollably and unless Cook takes some responsibility for the ****tiness of the opening partnership, it's going to take one hell of an effort for one of his myriad partners to stop it.