Projects like this are always a good idea but you're all starting from
the wrong end of all this.
If you ever want it to be serious, you have to get a good LITTLE circle
of great friends around yourself, who are fully dedicated and work
alongside each other and of course are skilled. Those big teams never get themselves proved because it's mainly just a usual "hunt of fame" not a productive progress.
I know very well that there are few projects that have made ALOT more
progress than HeroicWoW or any other, fancy-named thing.
Besides. Everything is possible if you just got some creativity. Those usual fight-and-conquer storylines aren't any custom at all just because it's something that Blizzard came out with. (Lichking , illidan etc.) If you want a good storyline , think wider and put there some meaning besides the fancy words of description.
(Hellgawd to be named of a few. Poetic words inside the empty pants.
Sorry if i'm huring your feelings but this makes me sick.)