As stated before, my opinion and the opinion of many Catholics is that Mary will eventually be crowned Co-Mediator with Christ. The reason that I think this is, is because the Catholic doctrine and dogma has continued to evolve over the centuries like a quilt, adding patches here and there.
Let's look at how the Bodily Assumption of Mary evolved within the Catholic Church.
Pope Pius XII served as Pope during World War II and promoted devotion to Mary. Catholics had already been petitioning the Roman Catholic Church for over 100 years to press them to formally declare that Mary had been "assumed" bodily into heaven. In his encyclical "Deiparae Virginis Mariae" of 1946, the Pope sends out a query to all the Bishops:
...We wish to know if you, Venerable Brethren, with your learning and prudence consider that the bodily Assumption of the Immaculate Blessed Virgin can be proposed and defined as a dogma of faith, and whether in addition to your own wishes this is desired by your clergy and people."
Petitions to declare the Assumption of Mary, came in from all over the world in response to his letter asking and desiring confirmation that it can be proposed and defined as a dogma of faith.
But in order to do this, some groundwork would have to be laid. Pope Pius XII sent out another letter (Humani Generis).
"...God has given to His Church a living Teaching Authority to elucidate and explain what is contained in the deposit of faith only obscurely and implicitly. The deposit of faith our Divine Redeemer has given for authentic interpretation not to each of the faithful, not even to theologians, but only to the Teaching Authority of the Church." August 12, 1950
Pope Pius XII was preparing to "elucidate and explain" how the Assumption of Mary, was indeed fact, although it was "obscurely and implicitly" defined in the Bible.
On November 1, 1950, Pope Pius XII signed the document titled, "Munificentissimus Deus" which is "Most Bountiful God".
Munificentissimus Deus, concluded with this:
"By the authority of our Lord Jesus Christ, of the Blessed Apostles Peter and Paul, and by our own authority, we pronounce, declare and define it to be a divinely revealed dogma: that the Immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory."
This is one of hundreds of examples why millions in the Catholic Church (6 million faithful along with bishops and cardinals have signed the petition for Co-Mediator) and many Protestants who follow the evolving dogma of the RCC believe that it is only a matter of time before Mary is officially given the title of Co-Mediator. In many ways she is already elevated to that principle in writings about here and more subtle titles of Redemtrix and Mediatrix.
With this evidence of progressively defined dogma, it is only normal and natural for people to hold this opinion of Mary, someday being crowned, Co-Mediator, especially since in Catholic writings she is ALREADY fulfilling various "mediation roles". Not to mention that the internal process of petition has been going on.
Axehead