From what I remember of the academic job market in the 1990s, this was a real issue. You had all these top level researchers filling positions that would have b

From what I remember of the academic job market in the 1990s, this was a real issue. You had all these top level researchers filling positions that would have been taken by newly minted PhDs. It resulted in a spurt of quality work being produced at the destination institutions, but I was even then concerned about the effect on the younger generations both in the West and the ex-USSR.