You have an element of truth here, but it is not eternal and Jews who have chosen to accept the Lord Jesus Christ are, I am sure, freed from this curse. As we see in the verses below it was the chief priests and elders who persuaded the multitude of people to condemn Jesus to death. Theirs is the greater sin but the people did say as in verse 25 "His blood be on us and our children." Sadly, this has been the case for this was and is the son of God.
If we look at the Old Testament the LORD God gave His people, the Israelites two options: Do my will and you will have great blessings, do evil and I will curse you. Very stark choices but what did they choose? To turn their backs on God. Sadly the Jews are not the only ones to do that. Jesus came to redeem people from their sins if they repented and were baptised following his example.
Matthew 27
20 But the chief priests and elders persuaded the multitude that they should ask Barabbas, and destroy Jesus.
21 The governor answered and said unto them, Whether of the twain will ye that I release unto you? They said, Barabbas.
22 Pilate saith unto them, What shall I do then with Jesus which is called Christ? [They] all say unto him, Let him be crucified.
23 And the governor said, Why, what evil hath he done? But they cried out the more, saying, Let him be crucified.
24 When Pilate saw that he could prevail nothing, but [that] rather a tumult was made, he took water, and washed [his] hands before the multitude, saying, I am innocent of the blood of this just person: see ye [to it].
25 Then answered all the people, and said, His blood [be] on us, and on our children.
26 Then released he Barabbas unto them: and when he had scourged Jesus, he delivered [him] to be crucified.
But this will not always be the case as we see here:
Matthew 13
15 For this people's heart is waxed gross, and [their] ears are dull of hearing, and their eyes they have closed; lest at any time they should see with [their] eyes, and hear with [their] ears, and should understand with [their] heart, and should be converted, and I should heal them.
John 12
40 He hath blinded their eyes, and hardened their heart; that they should not see with [their] eyes, nor understand with [their] heart, and be converted, and I should heal them.
Zechariah 12
9 And it shall come to pass in that day, [that] I will seek to destroy all the nations that come against Jerusalem.
10 And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for [his] only [son], and shall be in bitterness for him, as one that is in bitterness for [his] firstborn.
Zechariah 8
23 Thus saith the LORD of hosts; In those days [it shall come to pass], that ten men shall take hold out of all languages of the nations, even shall take hold of the skirt of him that is a Jew, saying, We will go with you: for we have heard [that] God [is] with you.
Zechariah 10
8 I will hiss for them, and gather them; for I have redeemed them: and they shall increase as they have increased.
Luke 1
68 Blessed [be] the Lord God of Israel; for he hath visited and redeemed his people,
Do read Ezekiel 37 which is too long to put here, but it shows the recovery of Israel and also Zechariah 14.
Micah 7
18 Who [is] a God like unto thee, that pardoneth iniquity, and passeth by the transgression of the remnant of his heritage? he retaineth not his anger for ever, because he delighteth [in] mercy.
Romans 11
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,
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this [is] my covenant unto them, when I shall take away their sins.
Sorry this is so long but there are prophecies concerning the Jews which shouldn't be left out. I haven't put them all here but you will find links in Bible margins.
I do hope this helps you. xx