It's high time to bury the old navigation in my opinion.
The iteration on the great cheese move appears to have ground to a halt now that MSE, SO and MSO have received the cleaner navigation.
I personally strongly prefer the new nav for slicing through questions, seeing which I can/should answer. The new/active/featured/hot/week/month views are counterproductive to me on the site I spend most of my time and I feel we would get better answer coverage if the changes I see would get rolled out to Ask Different. That being said, what's perceived as good change for one site might not be the best for the network as a whole.
Is there further debate that this iteration is bad/harmful?
If not, what is holding back this change from being rolled out to the rest of the network?