Imagine you have two children, a boy and a girl. The boy does something wrong and so you ground him for four (4) weeks. After the third week is finished, forget about your son and do something with your daughter for the next six (6) months. Then turn your attention back to your son for a "fourth" week. Any child will intelligently and correctly recognize that they were not grounded for a mere four (4) weeks, but for seven (7) months!
Sadly, this is how Dispensationalists view God. Forgetful and scatter-brained.
What kind of God do the Scriptures portray?
When it was prophesied that Israel would be slaves in Egypt for 400 years, how long were they slaves?
When it was prophesied that Israel would wander the desert for 40 years, how long did they wander the desert?
When it was prophesied that Israel would be captive to Babylon for 70 years, how long were they captive?
So how is it that Dispensationlists take a prophecy of 490 years to deal with Israel and somehow get a 2,000-year "parenthetical gap"? God cannot follow His own timeline? A "gap" of 2,000 years is a time period of 2,490 years. How is it that God prophesied all these time spans in the past and they were exactly as He prophesied, but when He prophesies 490 years there is somehow a magical "gap" of 2,000 plus years? Anyone else having an intellectual problem assimilating that nonsense?
Keil & Delitzsch, the greatest of the Hebrew scholars, have said in their Commentary On the Old Testament, "The sing. is simply explained by this, that שׁבוּעַ שׁבְעִים is conceived of as the absolute idea, and then is taken up by the passive verb impersonal, to mark that the seventy sevens are to be viewed as a whole, as a continued period of seventy seven times following each other." The 490 years are done. They are finished. They are history. It has been nearly 2,000 years since their completion.
There is no time left for dealing with national Israel because national Israel is nothing. God's people are Christians. All who will enter into Heaven will be Christians. There is one people, one body, one bride, one church, one true Israel—spiritual Israel, made up of every tribe, tongue, people, and nation. Paul made that clear with Romans 11:17-24 and Ephesians 2:11-22, and Peter made that clear with 1 Peter 2:9-10.
If your god is scatter-brained and cannot follow his own predicted timeline, then you might want to look for a different god. One who can add. Might I suggest the God of the Bible?