I guess a salvo or two of these used against a city would effectively a WMD... Is it possible to mine a comparable area with M270s?
I wonder what would have been left of central Europe after even a conventional WWIII with such systems (probably on both sides)
The expectation back during the recent unpleasantness, was that both the BRD & DDR would be largely destroyed, at least to June 1945 levels, if not worse (keep in mind that most scenarios called for CW, if not tactical nukes, as a basic element of any WP attack, although bio-weapons were unlikely until/unless a strategic exchange occurred). So blown all to hell with tons of "V" agents and probably a few dozen 5-15kT NUDET.
The damage to the rest of Western Europe was expected to be limited to ports and airbases, possibly with CW, almost certainly no nuclear deployments. There was a lot of concern that the French, who had a REAL independent deterrent, to the point that NATO would not even be consulted prior to use, would not allow a WMD strike on its territory without retaliation, and any attack with nukes on the UK was likely to provoke not just the British, but the U.S. as well.
How much damage with take place in the WP states, Norway, Spain, and the rest of Europe varies a lot, based on the scenario and when one of the two major powers decided that they were facing an existential threat, and made clear that things were going to stop or everyone was going to lose (a majority of later, open source, studies are big on escalation being almost unstoppable one the first NUDET occurred, however opinions vary).
If everything stayed conventional, any area where combat took place would require complete reconstruction, from the sewer lines up.