Very frankly, because baptism has now replaced circumcision, the Great Commission has irrefragable paidobaptist force. Jesus has commanded His Church to subjugate
"the nations" as such (including their infants) to the Great Commission. Yet from their antipaidobaptistic viewpoint, Baptists would never wish "the nations" as such to get baptized. Consequently, their hypothesis is not only a sacramentological and an ethical but also an eschatological error.
"He that believeth and is baptized" — includes babies! In the Great Commission according to Mark 16:16, we read: "He who believes and is baptized, shall be saved; but he who does not believe, shall be condemned."