IMHO, those in favor of open borders know it too and will fight any such initiative tooth and nail to keep it from ever getting passed in congress in the first place so as to not allow it to come before the people directly.
Funny how the edicts of unelected liberal Federal judges are hailed by their acolytes as "democratic victories."
The truly constitutional remedy, in the form of a amendment, scares the hell out of them and is to be resisted at all costs.
This from the people who are always screaming about the virtues of "democracy."