I'm not interested in Dark Rangers but I would probably play one if they made em. And I find it funny that people were trying to force a ghostbusters spec into tinkers and yet these same people can't think of how dark rangers could be a class.
Don't forget that Sylvanas is a dark ranger. They could add her banshee abilities to the class or any of her Hero of the Storm skills to the class as well as any necrotic abilities they wanted to. And thats not even counting bow skills.
https://wow.gamepedia.com/Dark_Ranger_(Warcraft_III)
And if they go off of the Dark Rangers skills from WC3 they could easily have a range dps spec. a healing spec, and a spec based on mind control/charm/Possession which if they tied them more closely to banshees could be pretty interesting and end up like like a druid/hunter combo where you can take over humanoids and use them like druid forms.