Alright so Vol'jin took a knife to the neck, his people were 'subjugated' for awhile, and the rest of his race is falling down a ladder carved out of villainbats and acting antagonistic when it should be approaching others for help (NOT THE MOGU).
What's more though, the Darkspear are genuinely falling behind in an increasingly industrialized world. Their 'headhunters' don't really hunt heads anymore because Vol'jin wants peace with the Alliance and frankly, spearthrowing and the like isn't going to be competitive much longer.
We already saw Bilgewater Marksmen replacing headhunters as ranged support for Grunts in the Twilight Highlands...
What's next for the Darkspear? They need to make some changes.