When the rune regen system took an overhaul in Cata, it was all great and nice and beautiful ladilaaaa...... But the problem lies in the rune regen/rng-based rune acquisition. The mechanics of runic corruption, runic empowerment and blood tap (which changed i believe, if someone remembers the old one please mention it) remains unchanged since WotLK. Its time to assess it.
Honestly speaking, DKS are at their best state for now. We are not perfect, agreed. But I believe they really need to think about the rune regen mechanic provided. I liked the fact that the mode of rune acquisition has been made optional through the talents, I absolutely love it. Just the choice of method, but not the choices in itself.
And there is no need to "simplify" DKs or anything about it.