Short answer is DKs likely won't be seeing a ton of changes before we go live; this class is still quite powerful (as it should be being a tank), even after some of the adjustments we've made to other classes and abilities.
If the Servers were ever going to be fixed, they would have been by now. Its common sense to know that it isnt a priority for ZOS. But why would it be when they can pump out fluff Crown Store items and broken Morrowind and still be profitable. They are going to spend their resources on what makes the company the most profit. So as long as players keep accepting the current state and buying Crown Store junk then it will never be a priority.