Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but of one, And to thy seed, which is Christ. (Galatians 3:16)
And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise. (Galatians 3:29)
The modern state of Israel can be vaporized off the face of the earth, but this will not impact God's plan, because "they which are the children of the flesh, these are not the children of God: but the children of the promise are counted for seed." (Romans 9:8). "What if GOd, willing to show his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction: And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory, Even us, whom he hath called, not of the Jews only, but also of the Gentiles?" (Romans 9:23)