Has the Manchester City empire fallen?

How do Pep Guardiola's struggles this season compare to the end of other great teams – and is there any way back?

There has, understandably, been a degree of caution about declaring that the Pep Guardiola project at Manchester City is irrevocably over. City have been so dominant, Guardiola such an architect of the modern environment, the financial advantages they enjoy so great that they have seemed untouchable: no side had ever previously won four English league t…