agreed... i think angels , demons, goblins , undead (vampires,witches, ghouls) should be always part of the fantasy 4x game. infact i really hope reguardless if they are part of lore or not that KAEL will add those as core factions to the game if not for EWOM put on fallen enchantress.
The fantasy genre (4x game or not) doesn't need elves, undead or anything like that. Hey, I like them (hell, I use my own versions for my mod) but they should never be a "must have". At least as long as whatever "races" are offered by the game are actually interesting and offer differences in the gameplay.
That said, I hope that Stardock, once things start really to settle down, can offer some models for other races and/or a modded new race that follows the "traditional" pattern of "elves, dwarves, trolls, orcs, goblins, skeletons, zombies, angels, demons, etc". Much like was originally planned as part of the support for modding. 