That goes without saying, but I believe epiclesis was much more pronounced in the Tridentine Mass, as in the Orthodox service. It could be a reminder that, just as is the case in the 1,600-year old Divine Liturgy of St. John Chrysostom, the same should (again) be made more evident in the Latin Mass.
Let's not forget, first of all that the Latin Mass never dropped epiclesis, and that the epiclesis in the Orthodox liturgy is pronounced by the priest in the low voice and therefore not heard by the congregation.
Well, that's true. It was probably all of these things. One of the many positive aspects of the Tridentine Rite was that it was much closer to the Eastern liturgies, and I think the Pope is also aware of this.