Amil has to discount the literal hermeneutical approach to the entire definition of the [Kingdom of God] in the major and minor prophets.B.B. Warfield, in The Westminster Assembly and Its Work, expounded and defended the biblical basis for the Westminster Confession of Faith (1646). But he also attempted to demonstrate how the Confession merely summarized the theology of the Continental Reformers. Though, as a Baptist, I don't agree with every point of the Confession or Warfield's defense, a paragraph from his discussion of Chapter 1, "Of the Holy Scripture" caught my eye.
In this chapter, Warfield quotes extensively and in broad affirmation of Heinrich Heppe's summary of the theology of the Continental Reformers, Dogmatics of the Evangelical Reformed Church (1861). Heppe argues (see the long quote below) that the literal meaning of Scripture is the one meaning the author intended. Though the author may or may not employ figurative language, the literal meaning is how the author intended that language (whether figurative or normal/non-figurative) to be understood.
In other words, both Premillennialists and non-Premillennialists* may employ a literal hermeneutic. (Individuals in either group may or may not, or at least not consistently.) Though they disagree on the interpretation of numerous texts, their disagreement is not over whether the normal ("literal") sense ought to be our default position. Rather, the disagreement is over certain texts—whether they were intended by the author/Author to be interpreted normally or figuratively.
And that's where the debate ought to take place. Premillennialists ought to argue with non-Premillennialists on how prophetic texts should be interpreted. Premillennialists ought to make the point that when we can point to biblical prophecies that we know have been fulfilled, they've been fulfilled in a "literal"/normal sense. But once and for all we ought to stop suggesting that non-Premillennialists reject a literal hermeneutic. By the standards of Premillennialists, Premillennialists often reject a literal hermeneutic too. By the definition Warfield advances via Heppe, both groups can be literalists. We can and should wrestle exegetically over the debated texts, but we need to avoid the strawmen and the canards.
Here's that long passage in which Warfield quotes Heppe:
The true sense of Scripture, which interpretation has established, can always be only single, and, in general, only the real, literal sense, the sensus literalis, which is either sensus literalis simplex or sensus literalis compositus. The former is to be firmly held as a rule; the latter, on the other hand, is to be recognized wherever Scripture presents anything typically; and only when the sensus literalis would contradict the articuli fidei or the praeceptis caritatis, where therefore Scripture itself demands another interpretation of its words, is the figurative meaning of them, the sensus figuratus, to be sought. Besides this, the allegorical interpretation has its right in the application of the language of Scripture to the manifold relations of life in the accommod. ad usum. (p. 168)
*Warfield was a Postmillennialist, a position now largely out of favor that was different in its interpretations from Amillennialism, but possessing some of the same tendencies to differ with the Premillennial "literal" interpretations.