I see it from another point of view - it's terrible. Okay, CoH3 comes as expected in Africa and Italy and which factions will be throughout the series of games:
Germans - 5 or 6 factions (if you take your reasoning)
USA - 3 fractions
Britain - 3 factions
Soviet Union - 1 faction
Italy - 1?
We are forced to play the same factions for the third time. This is just ridiculous.
Quinn Duffy did say in an interview that they could take CoH to anytime period and have it work out. I believe the player base of CoH isn't that flexible but I wouldn't put it past myself to play cold war era (Korean war - Vietnam - or even gulf war) Coh as the game and its mechanics can fit most modern conflicts and could even do future (think star wars rebels vs empire)
IMO what will be important for the next CoH will be how they decided to use their time to mature the IP, what new features will be added that push the game forward, what makes it more important than coh2, what puts it at the center of RTS. Relic is at a make or break for CoH to go just as big if not bigger than CoH1 and 2.