The predictable excuse will be it didn't work because it wasn't comprehensive enough, i.e. they didn't have the latitude they needed to force it on every other state and country. I mean seriously, which harebrained scheme of the Left doesn't eventually come down to some variation of that excuse? It's why they want everything to emanate from Washington DC, or increasingly from the UN in the form of some quasi-global government. The Left are never interested in competing on an even field, they are only interested in clearing the field.