I think it's still important that they issue a document, if only to make unambigous that Rome's position has not changed on this.
Just keep in mind that it took a long while for the reforms of Trent to take effect. They met the same stubborn resistence. A whole generation of malefactors had to die off before they were allowed to take root. Many never did, and in the 18th Century, laxity appeared again. Thank of the trouble that St. Alphonsus had, and he was a tough-minded guy and good organizer.