The thing is that the National Popular Vote Interstate Compact is nothing until it’s all the way there. Having 95% of the necessary electoral votes has the same effect as 0. So there’s no reason for opponents to even care about it until it is within striking distance of the threshold. It seems to me that if we ever reach a point where it comes down to just a state or two, that legislation will be fought tooth and nail, not just in those last states, but there will be fights and legal challenges in states that have already entered the compact to reverse it too. And even if we manage to win the fight and it gets activated, we will still have to keep fighting in perpetuity because almost any state pulling out would undo the whole thing.
I’m not saying people shouldn’t even try, maybe some good comes of it regardless. It just doesn’t seem like a solution as much as a statement.
The real solution is to allocate delegates proportionally to how citizens vote, as is done in Nebraska and a couple other states. This achieves exactly the same purpose as the NPVC but is actually politically tractable.
No state has any incentive to assign its delgates to a person the citizens of the state didn’t vote for. You can do what the NPVC does and make it contingent upon everyone playing along, but that requires everyone to play along and is incredibly tenuous. Even if it ever goes into effect, as soon as states allocate delegates to someone who wasn’t the most popular candidate in their state they’ll pull it, and the whole thing will fall apart.
Every state has incentive to allocate its delegates proportionally. That’s exactly what people want. They want that more than winner takes all. It doesn’t require a huge chuck of states to buy into it amd it isn’t tenuous. But it accomplishes the same goal; if states allocate delegates proportionally to how they vote, then the most popular candidate gets the most delegates. If you’re in one of the many states that has winner takes all, advocate to do what the few more democratic states have already adopted and are happy with.
This only solves it if you also make the number of delegates for each state be proportional to its population size. California has 68 times the population of Wyoming but only 18 times the number of electoral votes.
What you’re describing has never resulted in the popular vote winner losing the electoral college. The popular vote winner has always lost because states allocate delegates as a winner-take-all system.