This doesn't show God has forgotten His promise to the flesh seed of Israel at all. And the Apostle Paul gave this AFTER he had already mentioned the "For they are not all Israel, which are of Israel" message.
Rom 11:1-7
1 I say then, Hath God cast away His people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin.
2 God hath not cast away His people which He foreknew. Wot ye not what the scripture saith of Elias? how He maketh intercession to God against Israel, saying,
3 "Lord, they have killed Thy prophets, and digged down Thine altars; and I am left alone, and they seek my life."
4 But what saith the answer of God unto him? "I have reserved to Myself seven thousand men, who have not bowed the knee to the image of Baal."
5 Even so then at this present time also there is a remnant according to the election of grace.
6 And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.
7 What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded.(KJV)
The subject there is about the flesh seed of Israel, Paul's brethren born of Israel. Sorry to dissapoint, but God's Word says different about the eventual restoration of the 12 tribes of Israel.
James 1:1
1 James, a servant of God and of the Lord Jesus Christ, to the twelve tribes which are scattered abroad, greeting.
(KJV)
Even James wasn't confused about this. Come to think of it, neither was our Lord Jesus...
Matt 19:27-28
27 Then answered Peter and said unto Him, Behold, we have forsaken all, and followed Thee; what shall we have therefore?
28 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.(KJV)
The FINAL layout in the Holy Land of those twelve tribes is given in the last chapter of Ezekiel 48. And our Lord Jesus even showed us this through His servant John...
Rev 21:10-12
10 And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God,
11 Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;
12 And had a wall great and high, and had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:(KJV)
So when the re-establishing of the state of Israel in 1948 happenned, it should have been a sign for all of God's people, especially us who have believed on The Savior Jesus Christ. Meaning, we who have believed should not be so ready to cast off the seed of Israel that still refuses to believe today, because that can all change before the end of this world. He certainly never cast away the seed of Israel that did believe, as Paul showed.
Not every prophecy in the Old Testament has been fulfilled yet, and the prophecy of the restoration of the twelve tribes of Israel back to the lands of promise under Christ in final (per Ezekiel 37 and 48) is certainly one of them. THAT will always stand as a marker for what time we're in per God's Salvation Plan through His Son. That event has yet to happen today, obviously.
This world as it is today is NOT a sign of Christ's Kingdom to come. Instead, this world is being ruled by Christ's enemies! That's who is in power over the nations on earth today, and The LORD is allowing His enemies to rule today. When Christ comes that will all change. So this time today is not comparable to Christ's coming Kingdom, especially when our enemies who seek to destroy us have control over this earth. Wake up.