First of all, there are already 3 civs of Latin American based culture (Aztec, Inca and Mexican) not to mention Spain which is already the Colonizer is pretty much in the game. For a grand total of 4 ethnic/cultural Hispanic related background Civs. You want more? Are we going to release new Hispanic Civs every year? How about more Pacific Islander civs?
As a Colombian I am ok the Incas are the closest to superpower in pre-colonial South America had during this time period. Unless you want to do a whole expansion on Simon Bolivar and make A Great Colombian campaign (liberation of Venezuela, Colombia, Ecuador, Panama, later on Peru/Bolivia) cool but I think this would be an entire expansion pack and would require investment from MS World’s End to do it right.
But unfortunately they’re still trying to save the disappointment of a child called AOE IV. So I rather they didn’t touch LATAM for the time being and continue pushing out cool mini expansion civs worth the price of a proper DLC.