This is not a joke post or something and its not about anime exclusive but a series in general its just that anime will cost less and draw more attention (and there is already warcraft manga anyway), now lets talk about why. Blizzard is currently in the best opportunity for a Warcraft Anime based on none other than Thrall himself. Thrall is currently on a quest for soul-searching, he has left everything behind and tries to find the truth for himself and for what he should do in the future.
So there can be a series based on this part, through his searching and in a moment of desperation he will be transported to another universe and meet new people which resemble the Warcraft orcs but in a different way and can control the elements in some methods he hasn't seen before. During his adventures they will prove to him that his true power comes from within himself and not from the elemental lords and together with the new characters that he will meet he will defeat the villain of their world (who will probably be voiced by a popular voice actor from other anime) and at the end he will return back to Azeroth with his unlocked potential and a new voice which will represent his true power.
This will both be very successful and a good addition to the Warcraft franchise but it will also cover a big part of Thrall's story since in the game we will probably never see what he did in his journey until he returns. The final episode of this anime, and especially the last scene where he returns to Azeroth and familiar Warcrat characters greet him will literally be a huge success.