I'd like for civ6 to have more often DLCs, or three major expansions instead of two.
Okay I'll elaborate. Generally I don't think paradox dlc model would work out for civ franchise, however I think civ5 model could be greatly upgraded.
- Three expansions instead of two (civ5 community patches and some mods showed there was a lot things begging to be expanded, civ5 development cycle was really cut too early)
- DLCs containing new civs, scenarios, leaders and wonders being released for longer period than civ5 (where they stopped appearing after less than a year after release).
Civ6 is going to have a lot of perfect standalone DLC material (aforementioned civs and stuff) without need of messing with core mechanics outside of free patches and major expansions.