Yes prove-all,, God entered into the first Covenant with the intention to honor it as an everlasting covenant and He delivered it in those terms to Israel So yes indeed it was intended as an everlasting covenant with the Israelite nation... But as we know the Israelite's did not honor the part in the Covenant and thus the contract was broken and declared null and void.. So thus a New Covenant was needed to replace the Old Covenant.. So With the coming of the LORD Jesus Christ a New Covenant was establish one that could last, One where us faulty human beings could keep our side of the agreement.. Because as the Bible reveals humans could never keep their side of the Old Covenant... And we know they still cannot....
You are exactly right about fallen humans being unable to keep the commandments. And about the New Covenant... What does it look like? Well lets look at it in scripture.
The first place we see it by that name is in:
Jerimiah 31:*31**Behold, the days come, saith*יהוה, that I will make a new covenant with the house of Israel, and with the house of Judah:
*32**Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith*יהוה:
(This completely validates part of your statement. )
*33**But this shall be the covenant that I will make with the house of Israel; After those days, saith*יהוה, I will put my law in their inward parts, and write it in their hearts; and will be their Elohim, and they shall be my people.
(So the law will be written in them in the New Covenant. Has that happened yet?)
*34**And they shall teach no more every man his neighbour, and every man his brother, saying, Know*יהוה: for they shall all know me, from the least of them unto the greatest of them, saith*יהוה; for I will forgive their iniquity, and I will remember their sin no more.
(So there will be no more pastors when it happens. Every man will just know and follow Him. Do you see this where you live?)
*35**Thus saith*יהוה, 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;*יהוה*of hosts is his name:
*36**If those ordinances depart from before me, saith*יהוה, then the seed of Israel also shall cease from being a nation before me for ever.
(The seed of Israel still exists. As a nation. So the Torah life is still in effect.)
*37**Thus saith*יהוה; If heaven above can be measured, and the foundations of the earth searched out beneath, I will also cast off all the seed of Israel for all that they have done, saith*יהוה.
(We still cannot measure all the universe. We do not even know what really causes gravity and what the earths core looks like. We only have theories. So the seed of Isreal has not been cast off.)
*38**Behold, the days come, saith*יהוה, that the city shall be built to*יהוה*from the tower of Hananeel unto the gate of the corner.
*39**And the measuring line shall yet go forth over against it upon the hill Gareb, and shall compass about to Goath.
*40**And the whole valley of the dead bodies, and of the ashes, and all the fields unto the brook of Kidron, unto the corner of the horse gate toward the east, shall be holy unto*יהוה; it shall not be plucked up, nor thrown down any more for ever.
So the New Covenant goes into full effect when all of Jerusalem is Holy (set apart) fully to YHWH forever. Last I checked several other religions have temples there. Including a large gold dome of some sort..... So Torah still in effect as the way to live. (Not salvation of course- Messiah took care of that)
Lets look at the New Covenant verses on the New Covenant say?
Hebrews:6**But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
*7**For if that first covenant had been faultless, then should no place have been sought for the second.
(You will notice that this is almost a cut and paste job from Jerimiah as we go through this)
*8**For finding fault with them, he saith, Behold, the days come, saith*יהוה, when I will make a new covenant with the house of Israel and with the house of Judah:
*9**Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith*יהוה.
*10**For this is the covenant that I will make with the house of Israel after those days, saith*יהוה; I will put my laws into their mind, and write them in their hearts: and I will be to them Elohim, and they shall be to me a people:
(Again we are told that we will have the law inside us...that we will know it. Not that it will be abolished.,k)
*11**And they shall not teach every man his neighbour, and every man his brother, saying, Know ye*יהוה: for all shall know me, from the least to the greatest.
(So in the New Covenant there is no written bible or bible teachers. Everyone will just know. Does tjat look like today?)
*12**For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
*13**In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
So we are told how it will pass. And what it looks like when it passes. Are we told when? Yes, plainly Messiah himself tells us in
Matthew 5:18**For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled
At the end of everything. When it is fully fulfilled. messiah fulfilled much at his first coming. The rest is fulfilled by and during his second coming. That is why we are still keeping Torah during the Millennium according to scripture.
Because we are following it as a way of life until Heaven and Earth pass away.
When does THAT happen. According to the bible, right after the White Throne Judgement at the end of the Millennium.
Revelations 21:1**And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
Easy Peasy