I know what you guys will say, but look.
We haven’t really had any hero ranged class, and DH just so happens to be a…potent ranged class from wc3 so it wouldn’t be a stretch at all.
The new wc3 reforged also has a good model of what a ranged DH would look like, so there is no need to think much on designing the demon form.
I can’t think of a reason why it wouldn’t be plausible.