Success breeds success and the achievements of Walker, Quax, and Dixon in the '70s owes much to the examples set by Halberg, Snell, and Magee 10-15 years earlier.
If you were to ask the crop of rowers going to Rio, I'd wager that seeing Rob Wadell or the Evers-Swindell sisters winning gold played an important part in piquing their interest in rowing and their subsequent success in the sport. Stay tuned for a bunch of wannabe Eddie Dawkins cyclists over the next four years.
It's pretty hard then, when you haven't seen success for a while, to reignite interest in a sporting discipline such as middle distance running, where there are few role models. So why all of a sudden do we have three men in the 1500m event after all these years?
Well, it's probably the same reason the big cycling events are no longer being won by one loud-mouthed American.
The domination of middle and long-distance running by the Africans is showing cracks. The recent arrest in Spain of Jama Aden (coach of the world 1500m champion Genzebe Dibaba and many other Rio-bound runners) for possession of EPO casts doubt on the idea that the African success of the past 20 years is solely based on training barefoot on the African highlands.
Banning the Russian track and field team from the Games is a first step in the right direction for world athletics. Maybe removing the African advantage of geographical isolation from the competition drug testing regime should be the next. Perhaps then we will begin to see a level playing field once more and be able to breed some success in middle distance running in New Zealand.