Hey guys! I came across this thread on the wow warlock forum and encourage you to post your thoughts. Blizzard is listening right now and warlocks are requesting more demon options.
I definitely like the idea of capturing demons as Warlock like you would beasts as Hunter. It would probably be only a cosmetic difference, but that's fine. It would probably encourage Blizz to add more cosmetic variety for enemy demons as well, encouraging players to capture them like the rare beasts.