In other words, as more of the seperate Christians, be they Catholics who have left the Church or from other church communites see that those faith communities weaken they will more likely come home to Rome.
Assuming, as I do, that the successor will continue the trajectory traced by His Holiness toward greater recognition of the Tradition and sterner renunciation of the "dictatorship of the relativism" in today's world, we shall see some come and others leave, and in both cases just the right kinds of people doing their coming and their leaving. God is great and God is with us.