Sure.
And by the time a Dark Ranger actually comes, would those arrow chains even be relevant after we beat down the Jailer and 'redeemed' the Maw? The abilities we see in the cinematic are going to be as relevant as Covenant abilities and Legendary items. It's borrowed power from the Maw.
If we have a Dark Ranger, it should have come with this expansion where its most relevant. They can set up for a Dark Ranger in the future, but the more time passes the more different it will be from what Sylvanas originally portrayed, since she is ultimately going to have less relevance to the future of the story.
They made DKs when Arthas was relevant. They brought back Illidan to usher in the Demon Hunters. They're ending Sylvanas' story and role, so what's it going to take to bridge in a Dark Ranger class that is supposed to be relevant to Sylvanas? Whatever it is, it's not likely to happen soon after the next Raid and Sylvanas' fall. If they want Dark Rangers to be playable, they wouldn't be writing her out as a supporting villain to the big bad of the expansion and as a raid boss who drops special weapons that grant Dark Ranger abilities.
I'm literally talking about plausibility right now, and if you can't see this as a warning flag that it's not a good sign for Dark Rangers in the near future, you're just overly hopeful of what you want to see rather than look at how the devs are actually taking the direction of the game and their class design intentions.
If you were planning to make a Blademaster class, would it make sense to you to make Samuro a raid boss who gives Warriors a Legendary Katana that gives them windwalk and mirror image in the current expansion?
Blizzard is giving Hunters the ability to RP as a Dark Ranger. They're seemingly concluding Sylvanas' story. We're very likely going to beat the Jailer and leave the Shadowlands and all the Covenant powers by the end of the expansion. Let's address the elephant in the room before we start theorizing how the other Dark Rangers in the forsaken would suddenly gain Banshee powers and start using Jailer-style Chains of Domination and Maw powers.