From what I understand, the Oceanic server is the result of a consistent and vocal large player base who had organized themselves and had been making themselves known for years. They basically proved that a data centre there would not be a wasted expense. Not saying that a South American data centre would be a wasted expense, but it needs to be apparent to SE that that's not going to be the case. They basically need to see the proof it will be worthwhile. I'm sure they'll also need to see the Oceanic server pay off now as well given that if they don't see the results there I doubt they'll do it again elsewhere.