I remember being taught about the EC for the first time. The lesson was basically, "Did you know that we don't actually vote for the President? We actually vote for Electors who elect the president! But don't worry, kids, it's a formality. The chances of a president winning the EC and losing the popular vote are so remote as to not even be discussed." That would have been in like 1992, let's say. I got to vote for president for the first time in 2000, the same year I graduated high school and turned 18. So I have lived a mere 40% of my adult life under a president who won by popular assent.
Making the EC moot is far easier than abolishing it, since the former only requires a change in state laws and the latter a constitutional amendment. The 270 compact would de facto abolish the EC overnight. I hope that if there's a blue tidal wave at the state level this fall, that it would be on the agenda of many state legislators. The recent SCOTUS ruling is actually a huge win for the 270 Compact, since it would obviate any faithless electors from saying, e.g., "I'm voting how OH voted, not how NY voted, fuck you." A 9-0 ruling also makes GOP court challenges to its inception a hard sell. So I don't think the ruling on its own is that bad. It's a simple plain reading of law, and it's not SCOTUS's fault the law is dumb.
Liberal activists have put a lot of effort into passing redistricting commission laws that make it harder to gerrymander House seats, and they've had a lot of success pursuing that goal in swing states. They have proven that they can take their case to the people, so I hope they'll fight hard for this change, too. I'd throw money at any group trying to get that shit on the ballot.