"will be made permanent for the 2025 tax season with all 50 states and Washington D.C. invited to participate"
It seems very much that this is an opt-in thing, state by state. I would suspect that the results of this will be most Democratic-leaning states at least trying to opt-in for next year, and many Republican-leaning states refusing loudly during this election year, then quietly starting to opt in in a few years.