Do you TRULY believe that praying an extra set of Mysteries to the Rosary which concentrate on Jesus' works here on Earth could destroy the Church? I fail to understand how Devotion to Jesus and his Mother could be harmful in any way.
The changes to the Rosary can only be harmful if people continue to snipe at everything this Pope tries to do to bring the True Faith to people where they are today. Many Catholics today, as a result of folks using Vatican II as a smokescreen to 'modernize' away from Jesus, have lost any true connection to Jesus' ministry on Earth. If the addition of these simple 5 mysteries will bring more people to this beautiful prayer, it can only do good.
We need to stop treating devotions which have been added to the practice of our Faith, like they were written on the stone tablets brought down by Moses. Devotions have changed over the years, and will continue to do so. Instead of crying and rending our garments when it happens, let's just turn our eyes toward Jesus. He'll set things right for us, either by turning peoples' hearts to make the devotions the best they can be, or by turning ours so we won't be so darned mired in the past that we can't see the fruits of the devotions, which after all, is why we attend them.