Hehe I believe ED knows what are they doing, their in the business for quite a while now.
Formerly Lock On : Modern Air Combat, it still has it's " Modern " image sticked on it and I doubt it will go full WWII side anytime soon. Still loads of Modern Marvels to come ... F-18 among them, which is probably the most demanded module. Then comes choppers where DCS offers a veruy high level of realism.
I would love everything comes in DCS, Cold War, Vietnam, WWII... but it's just too much work for a single module, they can't, as you indeed stated, come all at once.