Well, here's a hint for PD. Make a general grand strategy game engine that, kind of, fits any earthly era. At release there would be, I dunno, only a map of the Runemaster universe(a collab with its devs). Then PD could start to make content DLCs about other franchises that are willing to do collab.
For example PD says to the owners of Lord of the Rings franchise: "You and me, my strategy game engine and your lore, lets bang." And a few months later a new DLC is annoucned: "Grand Strategy: The Middle Earth", which features some DLC specific new engine features that this setting requires and a map of Middle earth with all the events and stuff.
Then PD goes to the pub again and meets TES: "You and me, my strategy game engine and your lore, lets bang." And a few months later a new DLC is annoucned: "Grand Strategy: The Elder Scrolls", which adds some Elder Scrolls specific features and has an Elder Scrolls map made with the co-operation of the owners of TES.
Then PD goes to the pub again and meets Warhammer: "You and me, my strategy game engine and your lore, lets bang." And a fer months later a new DLC is annoucned: "Grand Strategy: Hammers of War", which adds some Warhammer specific features and contains a Warhammer map with all the Warhammer happenings.
Then PD goes to the pub, yet again, and meets Dragon Age: "You and me, my strategy game engine and your lore, lets bang." And a a few months later a new DLC is annoucned: "Grand Strategy: Age of Dragons", with Dragon age specific features and a map of the Dragon age universe.