“This is a unique issue relating to Route 9, which transverses most of the eastern seaboard of the US.”
The “Route 9 shita” is well known, at least among the eruv cognoscenti. However the more fundamental question is still whether there would ever be a rational basis for any segment of the tzibur to publicly oppose efforts by another to build an eruv that meets their needs and is consistent with the views of their Rav. In simple terms, no one would be forcing anyone else to rely upon the eruv and thus opposing efforts by other yidden to build one would itself be assur.