I dont understand the aversion to the Aztecs or the game continuing on beyond 1453. After the fall of Constantinople European efforts turned to finding a westward route to India so the inclusion of the Aztecs in the 1492-1530 span of the game is perfectly justifiable.
My only complaint would be how to make the Aztecs challenging opponents as an end game climax. By 1492 most players wont have any serious rivals left in the Old World to compete with, whilst if it comes to some 10% thing people will spend the last few turns min-maxing by disbanding all their bad troops and building loads of elites to ensure the 10% is as big and deadly as possible.
I can only imagine the New World will be a seperate campaign start, wholly seperate from the Old World campaign - with maybe the benefits of new world empires abstracted in the Old World campaign.
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