This popular vote initiative is so constitutionally abusive, I don’t know how anyone can take it seriously.
But, then, sometimes I think that our laws have gotten so complicated that there is rarely a clear answer to anything. I think about it in the Godel sense of, within a complex enough system, statements can come up which can neither be proved nor disproved. Of course, the law, despite its physics envy which enshrines precedent as settled law, is much more capricious than a rigorous mathematical system.
But, I am still left with the feeling that the law is so ornate that there are many pockets that are unpredictable, perhaps deliberately so. That’s why, for example, CNN can go on for hours about the happy possibility that something Trump or someone he knows can be construed as a technical violation of some law, any law. No one knows.
If Election Day is on November 6th (for example) and the Electoral College doesn't meet until mid-December, then any state that joins this "compact" has more than a month for their legislature to pass a statute that withdraws the state from the agreement.
Since none of this is binding under Federal law, no state has the power to enforce such an agreement with any other state.
In other words, it's all just theatrics ... carried out by state legislators who are so useless they have to make up sh!t like this to fill their days.