There isnt a debate.
One of the major parties in the USA knows that they are able to get power only because the 1929 Apportionment act artificially buouys the power of less populous states in the House and by extension the electoral college. The other one is just fine with actual proportional representation.
Not t metion that the EC doesn't encourage presidential candidates to campaign nationwide: most states are ignored, and focus is on the minority of swing states.
(and Lincoln had a clear plurality of the popular vote. He woukd have won a national vote too.)
Politics doesn't happen in a vacuum.
When the NPVC goes into effect, both major parties will run whole-country campaigns and swaths of the nation that are currently ignored will get actual attention. While some states may have pullback campaigns, its also likely that other states will react by joining the compact to preserve the new status quo of not being ignored.
(the compact itself does allow for states leaving, and even sets a nice 6-month time offset. )