The Economist has an article on just how far Brazil will have to go,
Holding the games will require effort and expense on a scale that Rio, a problem-studded metropolis of 12m (half of whom live in the city itself), has never seen. Apart from new stadiums and other sports facilities of all kinds, the plans call for new bridges and roads, and a doubling in the number of hotel rooms. To revamp a chaotic transport system, engineers will blast through granite mountains to extend the metro from Ipanema to Barra da Tijuca, 13.5km (8.4 miles) away. Tens of thousands of athletes must be squired to scattered events through some of the worst traffic in the Americas.
The police, already overstretched, must keep the Olympians safe from some of Latin America’s most brazen criminals—they committed over 2,000 murders in the city itself last year. Where padding public-works contracts and sticky-fingered politicians are the norm, who will make sure the $14.4 billion budgeted for the games will be put to good use—to say nothing of up to $50 billion in indirect investment?
Will they be able to pull it off?
We shall find out in time.