As the Theonomists themselves are wont to say, their Postmillennial vision is dead apart from Dominionist theology, what Kline here calls the rejection of the 'way through the wilderness'. And I would add the corollary, that Dominionists are de facto Postmillennialists. Whether they espouse that specific eschatological scheme they are in effect operating by and under its ethical imperatives as well as its dangerously flawed understanding of the Kingdom. Their Kingdom paradigm is correctly identified by Kline as the very thing we are being warned against in the Apocalypse.
As Kline concludes his commentary on Zechariah's first vision, he says the following:
Revelation 20 knows nothing of a political dominion of the church over the earth during this millennial age of the great commission. That expectation is a delusion of the prophets of theonomic postmillennialism, who, in their impatience with the way through the wilderness, have succumbed to carnal cravings for worldly power. It is revealing that in order to defend their false forecasts they find it necessary to scorn as losers those whom the Scriptures honor as overcomers, indeed as "more than conquerors" (cf. Rom 8:35-37), the martyr-witnesses who overcome Satan "because of the blood of the Lamb, and because of the word of their testimony, and they loved not their life unto death" (Rev 12:11). One cannot but be appalled at the railing of certain of these reconstructionist postmillenarians against the Holy Spirit's soteric ministry thus far in the church age. What has been in the eyes of heaven a triumphant working of the Spirit of Christ, effecting the salvation of all God's elect in every nation and every generation without fail, a sovereign fulfilling of the good pleasure of God's will to the praise of his grace—this is dismissed by the pundits of this postmillennialist cult as dismal failure and a history of defeat. Nothing betrays more clearly than this blasphemous contempt for the gospel triumphs of the Spirit how alien to biblical Christianity is the ideology of theonomic reconstructionism.
Glory In Our Midst: A Biblical-Theological Reading of Zechariah's Night Visions, pp. 53-54