You got that right. Wisconsin is already a museum.
Only the weatherdecks (and limited interior spaces) are Open to the public. All humidification and corrosion protection is still maintained by the Navy. The New Jersey and Missouri are not being seriously degraded but are not maintained to this level which would allow for a quick reactivation. Iowa is actually in better shape (Turret #2 is nearly repaired and the needed parts are stowed in the turret) I would keep atleast 1 in this condition for future contingencies but see my post #85 for the best option going forward)