I agree that the context does imply a unity of purpose between Jesus and his followers and Jesus and the Father. Mentioning the followers is the clincher that makes think there's more here than just Jesus claiming to be God. But yet, overall, the gospel points to Jesus being divine.
Origen believed that Jesus was created, and that of all the souls, he drew himself most closely to God. Through many eons he became identical to God in thoughts and motives.
I don't think its too much of a stretch to read that sort of union into John. That Jesus' followers can be one with him and the Father while still in the flesh, can still be a possibility in the facets that count most (trying to have the heart and mind of God). Maybe the gospel also is holding out the prospect of those souls later being drawn just as closely to God and being remade perfectly.