In my eyes, CoH1 and CoH2 have both been a success, the community is still strong after 7 years, you can find matches fairly quick etc. So I see no reason why relic wouldn't want to give it another shot and perhaps it has already begun.
'member when they gave another shot with DoW3?
DoW1 and 2 are still played and active, given both ride on mods exclusively, but still.
I just wish devs knew when to innovate and when not to.
Relic got way ahead of themselves with DoW3, innovating for the sake of innovation and made a title that intended to appeal to both playerbases of previous DoWs and at the end appealed to no one, while Blizzard prefers to make such a baby steps with innovations that they don't improve on anything else then graphics and in fact, overall they just fall in regression(how after WC3 they made a massive step back for SC2 is beyond me, especially since they STILL are going back to the past with SC:BW now and WC3 lolforged).