You think we didn’t do a particularly good job of the London Olympics? Well, take a look at the state of the Maracana a few months after the Rio Olympics. 
It really is astonishing how so many countries crave hosting the Olympics only for the result to be a massively expensive party followed by a massive bill and crumbling, under- or unused infrastructure. Compared to recent examples (Sydney, Athens, Beijing and now Rio), London was a model of financial probity and foresight!