The trinitarian view is that this subordination describes the relationship of the Father and the Son, given that the Son is both God and man.
So subordination isn't a contradiction of the trinity doctrine; it's a part of it.
As you know, there are a lot of subordination passages like this, including John 14:28.
Most trinitarians also believe that Jesus rose bodily from the grave, so he is still man as well as God and will be so for all eternity.