Have you turned it over in your mind recently. A quck search found a book predicting that soon Dallas will discard this innovation.
Also found this.
Dispensationalists begin by clearing the board of all opinions except their own; they dismiss as useless and false all historic interpretations. Next they divide the human race and the Bible into three distinct groups (this is convenient since any scripture which would otherwise refute their interpretation can be relegated to another "division" of Scripture). They add many arbitrary elements which are not supported by the Scriptures, such as extra captivities, extra kingdoms, extra covenants, extra judgments, extra ages, and so on and on. All of these stand or fall together. To disprove one of these premises is to collapse the entire theory.
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Back later. My boys need new shoes.
As a formerly convinced dispensationalist, I would honestly like to revisit my errors with you.