This is probably a fool’s errand, because it’s all or nothing, making it inherently unstable. If we ever get within striking distance of having enough states to cross the threshold, the law will be fought tooth and nail to prevent passage, and this battle would continue in perpetuity in every remotely purple state that has the NPVIC law in place, trying to get enough overturned to stop it.
Maybe it accomplishes something useful simply by bringing the conversation about reform to the forefront? But as an actual solution I’m completely skeptical, as much as I like the idea.
I don’t know what country you are from or how your voting system works. But I will guess that your country has many parties and after the election, a governing coalition is formed.
In the US voting system, similar parties get punished by stealing votes from each other. So, in effect, we have to form our coalitions before the election and choose the single candidate that will stand for all of us. So, you can think of the Democratic Party as the Democratic Coalition, made up of some truly left-wing factions, as well as some not very left-wing or even centrist factions, and so our candidate will be much more watered down than what you’d see in a different system.