the lore for meta states that illidan didnt achieve it until he got the skull of gul'dan which means it only happened about 30 years ago, there were lots of demon hunters running around for 10k years before that happened so its unlikely that they would know how to do it and most of them have probably never even met illidan.
so if blizz used that as the excuse to let demo keep meta would you still play a demon hunter?
if you are one of the few that dont want demon hunters or wouldnt play them please dont vote. this is to see if those who do want demon hunters would complain alot if they didnt get them which is the main argument for them not to be added to the game.
everything else about the demon hunter would be the same, the look, the feel, everything would be demon hunter the only difference is that one spell.