God's Will could never be fulfilled. Israel cannot or will not disappear or the word of God would become void. They have to be there says God because the sun and the moon and the stars are still around so it still applies till this very day.

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Thus saith the Lord, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The Lord of hosts is his name: If those ordinances depart from before me, saith the Lord, then the seed of Israel also shall cease from being a nation before me for ever.
Jeremiah 31:35-36

If that's not good enough then listen to what Jesus says...

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And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
Matthew 19:28

There has to be an Israel when Jesus returns plus all twelve tribes of Israel. So where are all the lost tribes of Israel located it's not just Judah. Where did they all go and who are all their decendents.