It's the same again like it was with the world cup. Big trara and people of brazil wont have anything from, except new big stadiums which they prolly again rebuild to houses, like they did before.

The only positive aspect, for me personally will be, that there's kind of an official eSports olympics the same time in brazil.
This is most likely to show the world what esports are about and that they should get their chance at the next olympic games as well.