I mean sure, it's fan-canon that the female draenei have horse dicks, but i'm talking about in game here. If they reproduced, built multiple of those crystal vessels that travels across dimensions to seed other worlds with draenei life, which would work fairly well since they have a rather long life span. This way the'd colonize every known place within a few centuries, while also making Kil'jaedens revenge boner really troublesome considering how hard it'd be to kill them all.