In fact, that's
exactly what Paul said. To quote it again:
ἐλθούσης δὲ τῆς πίστεως οὐκέτι ὑπὸ παιδαγωγόν ἐσμεν.
But once faith has come, we are no longer under the tutor. (Gal 3:25)
He specifically said "we are no longer under the tutor." Why? He covers that in Galatians 4:1-5.
What I am saying is that as long as an heir is underage, he is no different from a slave, although he owns the whole estate. The heir is subject to guardians and trustees until the time set by his father. So also, when we were underage, we were in slavery under the elemental spiritual forces of the world. But when the set time had fully come, God sent his Son, born of a woman, born under the law, to redeem those under the law, that we might receive adoption to sonship.
"Elemental spiritual forces of the world" is another way to say the forces operating in the Torah, under which Paul states that the Jewish people were subjected as slaves. The "guardians and trustees" refer also to the Torah and to the leadership of the Jewish religion - which was put into place to keep people from sin. Once faith comes, however, you are considered "mature" and no longer need to be kept like a slave - since you are now a "son" instead.
Your interpretation of the analogy might be fitting in the eyes of many, but it isn't how Paul interpreted it. Alternatively, the
παιδαγωγός is only a leader of a
παῖς ("child"), upon which the word is built (
παῖς + ἄγω). They lead (
ἄγω) a child (
παῖς), not a mature heir of the kingdom. According to Paul, since Jesus, you are an heir and a son, no longer a child and no longer under the supervision of the tutor (
παιδαγωγός).
