a very bad ideaEuropean Region Pack: Poland, Hungary, Austria, Portugal, Netherlands
Americas Region Pack: Inca, Maya, Iroquois, Brazil, Mexico
Asian Region Pack: Khmer, Dai-Viet, Manchu, ??, ??
Ancient Empires Pack: (Missing Civs from Vanilla), Judea
Then the ACTUAL xpacs can focus more on gameplay changes (like they did for Civ4) rather than just shiny new civs.

But really, if they do, they will get great dislike. Just don't make the game like Sims ok.
well 2expansion packs were already more than enough. Warlords and BTS.
What I understand from EP is to detain fans till civ6.
And the EP should have gameplay changes as well, not only new civs, like u also said.