By Scott Salmon
RIO DE JANEIRO, BRAZIL - In this era of virtual reality, the four-yearly spectacle of the Summer Olympics may already be on the wane. Like World’s Fairs before it, the Games may gradually fail to galvanize global attention and fade from prominence.
But, as it stands, the Olympics face a more immediate threat: they have become prohibitively expensive to host.
Even as their budgets soared, every Olympics since 1960 has involved . . .