>>535133170
>What if they actually manage to pull off a successful 40k game?
WHEN they pull off a successful 40K game, you mean. It'll be a trilogy like WHFB was, in order to maximise the opportunities for $$$ from DLCs (easily enough playable races to justify a trilogy too).
Historicals will probably still exist but they'll only be viable if they go for large map games that make room for lots of different factions (Rome 1 & 2, Medieval 2, Empire, etc) while more niche games would have to be hyper popular settings to succeed (like Sengoku Jidai Japan in Shogun 2).