Bangalore: 'Once great': in sport, it's one of the commonest clichés to describe the obvious - a major force on the wane.
In individual sport, it's easier to place. Just find a former champion who should, really, just walk away with dignity. You call that person 'once great'. When s/he does take the hint and retire, forget the last bit and remember the halcyon days. End of story.
In team sport, it's a bit more complicated. If a team is in a trough, the solution could be to change the personnel, or wait for the right combination to get together. It is a fact that, while there is always a swansong for an individual, a team endures. It must suffer humiliation as lesser teams push it down. It must wait for a turnaround, because the turnaround will almost certainly come.