Air Nikes N Hats
Poor mans Johnny Football Lifestyle!
I'd say make a KD3, then let it breathe, have him involved or atleast use beats from him in all future Nas projects even if it isn't majority produced by him. Kind of like RZA on Sipreme Clientele.
If he does do another producer collab it should be with someone who has a completely different sound than Hit-Boy, that would be a great artistic challenge for him. Somebody like Cardo would lace Nas.
It can work the other way. Hit-Boy is likely an even more in-demand producer, and he'll probably want to branch out and do a full project with another big name, or even an up and comer with potential. After KD3, sure....him and Nas may branch of a bit.......but even if they dont....if it aint broke dont fix it.