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. )
Depending on your state that’s probably true… Unless, like Georgia (or maybe Texas soon) you have an even where a Red-controlled state goes Blue by a thin majority and the NPV keeps special attention away from them.
I can honestly see Texas republicans joining the NPV if they go POTUS-blue just once. Especially if there’s any downballot effect.