I can see pros and cons to this change and I won't argue with you because I agree with much of what you say and though, at first, I was delighted about the new mysteries I haven't found it in my heart to pray the Rosary and use them as mysteries.
I think we should all pray about the change and ask Mary because we all know how powerful the intercession of Mary can be.
See my posts #178 & 218.
I second your motion that we pray for Mary's guidance. A good idea in every situation.
LOL..how about asking GOD about praying to Mary FIRST...Have you EVER done that?. If you ask Mary if you should BTW that would not be INTERCESSION (think 1st commandment)