Making that change would be at least as difficult as getting it passed in the first place has been, probably harder, since for that to happen each state would need to pass a new law amending it.

I don’t think the compact allows for only counting votes from participating states, but otherwise yeah.

I don’t expect there to be lawsuits from the compact “flipping results” as you put it, partly because that’s entirely the wrong framing for how it works but mostly because all those lawsuits would be gotten out of the way when the laws first come into effect. The reason flipping a state’s results is the wrong framing is simple, the compact only comes into effect when there are enough electoral college votes participating to be able decide the election on their own. At that point it is meaningless to say someone “won” any individual state, because the only number that matters is the national vote.

The only way red states would be disenfranchised in any way would be if presidential candidates decided it wasn’t worth spending money on them to earn their outsized voting power. Under this scheme everyone gets an equal say in who becomes president, unlike now where your vote in Wyoming counts for about triple your vote in Indiana because Wyoming has the bare minimum of three electoral college seats and only the population to deserve one.

Take a guess at how many red states have signed onto the compact at this point. It’s zero, exactly zero red states have signed on to this.

The cause behind the two party stranglehold is the first past the post system, not the electoral college or voting districts or anything like that (Duverger’s law). Choosing the president by popular vote will be great, but it won’t solve that.

The point of ranked choice voting isn’t as much to get higher quality candidates in any individual race, it’s to break the two party stranglehold that first past the post forces on everyone.