Toward the end of your piece, you wrote:
The legislation (in the form of an interstate compact) would take effect only when enacted, in identical form, by states possessing a majority of the electoral votes—that is, enough electoral votes to elect a President (270 of 538).
I would add another explanatory sentence here, that fleshes out the implications of the delayed enactment. Something like: Until that time, participating states would continue to allocate their electoral votes as they do now.