I'm not holding my breath, but it would be nice. The best chance would be if democrats won the election while losing the popular vote, since that would likely get conservative states on board.
If you look at the map it really drives home how you only need a small collection of purple states to push you over. Imagine if democrats could really push hard and retain solid control over some of these states. It would make this compact foolproof. Imagine if the compact goes into effect but the red states just change their minds and don't enforce the laws on the books.
By making it so that these few purple states retain solid blue control, it help preempt this possible last pushback. that would go a long way to changing the landscape. All of a sudden it would finally sweep away all this conservative nonsense by clearly showing that it is not as popular of a position as it seems right now and the current democratic position becomes the base level conservative position. That will be the lasting legacy of this compact I so badly want to see in my lifetime.
My hunch is they need to push harder into turning PA solid blue. Maybe AZ long term? Or maybe Iowa. Maybe just pick off the small states like Iowa, NH and include PA and that should be enough votes to solify the compact.
It wasn't so long ago that Kerry won the popular vote and lost the (contested) electoral college. The feeling seems to be that there are enough small democratic states that the advantage can go either way.
[1]:https://en.wikipedia.org/wiki/National_Popular_Vote_Intersta...
Assuming all pending states enact the compact then there are only two electoral college votes remaining.