It's really a pointless adjustment. DW Unholy and 2H Unholy play identical. The one small change is that DW throws down DND when possible, since a DW SS hit does less damage than a 2H SS hit.
Otherwise you're still stacking DT, still using procs for DC, still hitting SS/FeS at the same times.
It does make sense to remove it in that when people hit the appropriate gear, and DW starts to become the better spec, everyone will flock to it. But that argument could be made for every single spec/class in the game :P
As far as all this math, you can sim out both specs right now using BiS heroic raid gear, and DW will end up doing more damage. I didn't even bother to add in DND as an unholy rune either. Gear of that level won't really be available to too many people before that spec template is removed anyhow, so...