Those who cancelled trips or were scared away: you missed a great time! My cousins who came to visit loved it and mentioned because of the weak real they were able to do twice as much stuff as they did in London and never felt unsafe (though they said that wouldn't be the case were it not for the extra security). Zika was essentially unheard from except at soccer games and the new metro worked flawlessly.
Let this be the end of the "will they be ready?" story the media puts out every four years- every event was contested on time and all gold medals were given out. If brasil can do it...