Damn, that is one ugly Olympic Stadium, nothing like the initial proposals, the last trully iconic Olympic Stadium was the Birds nest in Beijing in 2008.
If there's a clear example of what an Expo can do to a city it is Lisbon, the eastern part of the city was an industrial wasteland, now it is one of the more fashionable and expensive parts of Lisbon.
The protests in Portugal were justified, they even should have been greater in order to cause the fall of this right wing government, but in Brasil's case for the outside looker these protests are unexpected.
Lisbon or Porto should bid to host one of these Sessions, Portugal is one of the best countries in the world when it comes to host these type of events. Great food and great weather, excellent conditions with great auditoriums.