Seriously, we have a WW3 forum? as awesome as that is, it kinda brings it into the realm of reality. Is it honestly that inevitable? scary
i wouldn't consider it inevitable because we now have a forum dedicated to it, it's merely a method to keep other forums clean and cluster related material in 1 section.
As for nukes, small yield tactical nukes could be used with 'limited' radiation release. The areas targeted obviously wouldn't be habitable, but "collateral" damage could be minimized. I don't expect nukes to start flying as we're basically at the point that once 1 goes, they all go.