[Marcello]

"And one nuke detonated above the battlefield renders all this lovely tech useless. Ahh EMP how wonderful you are."

AFAIK modern military electronics are all somewhat hardened against EMP effects. I imagine the trasmissions would be jeopardized for some time, thus in theory negating the supposed FCS networkcentric advantages for the units involved but that would be a small consideration compared to the fact that the nuclear threshold was crossed. The adversary would have brought nuclear retaliation upon itself.