Anyway, I think this system is wrong, because if it gets passed (which I doubt it will), the states that haven't signed the compact are going to be totally irrelevant to the election.
Incorrect, it changes absolutely nothing. Every state still retains their electoral votes and they are all able to distribute them as they see fit.
While they do get to distribute them as they see fit, it seems rather disingenuous to me to say that it changes absolutely nothing. As Rochambeau pointed out, this would be essentially the same thing as replacing the electoral college with a nationwide popular vote; in other words, how the other states distribute their electoral votes would be rendered trivial. Maybe it wouldn't make a difference most of the time, but it would make a difference in elections like 2000.
Still, the system remains identical. Each state will have a method for determining electors (in this case a majority going to the natinoal popular vote). That doesn't make any state any more irrelevant that it already was.
In theory the system remains identical. In practice it is being traded out for a nationwide popular vote, because the same system will now produce a result according to that criterion. It is like taking a soda machine outside of a gas station, stocking it with candy instead, & then insisting that the machine is identical & therefore nothing is changed.
My point is that it may be the case that it in fact does not make any state any more or less relevant (though that seems highly doubtful). Any idea of the system remaining unchanged is a red herring, though.