Gol is a Brasilian low cost airline but I think that EasyServis could have been saying bar those two.
I think that it wouldnt work in Argentina. Whilst Argentina's geography would work for such an operation, the current depression means that fares on mainline carriers like Aerolineas and Southern Winds are very low.
However, Chile and Mexico which have a monopoly and duopoly respectively would definately be ripe for such an operation to increase competition and lower fares.