A WWI/WWII Total War would have to tackle several new issues, namely incorporating Air/off map indirect fire, strategic attack, presumably bigger battles, and a continuous front.
As for fantsay/Sci Fi, how about Star Trek Total War? Tie it in with the new movie release, and it already presents numerous factions to use for a campaign. The biggest problems would be handling the issue of 3D maps/combat, but given that many Star Trek/Star Wars games have used basically two dimensional campaign and combat maps, that would not seem a prohibitive problem.
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