Ordinary Time begins today, and (how fitting is this) the Gospel is the beginning of Jesus' public ministry. And he begins with the declaration that "This is the fullness of time: the Kingdom of God is at hand. Repent and believe!"
I found a whole page full of "Prophet of Doom" cartoons. You know, "Repent! The end is near!" None of them say a thing about the fullness of time. And yet Jesus' words imply that we need to repent not because of impending doom, but because without repentance, we won't be able to take in all the fullness that is bursting in our midst. Unrepentant, we are just too small.
If the "fullness of time" was inaugurated with the coming of Jesus (as Paul says it was) and "all fullness resides in him," then saying "the fullness of time," "the Kingdom of God" and "Jesus" are all the same message! It is still the fullness of time! Repent and believe!