I am not entirely sure I understand your argument, but, based on other posts of yours, I am fairly confident that we agree that "heaven and earth passing away" language is metaphorical in nature.
I don't have much time, but let me walk you through these verses given some basic background.
{18} "For truly I say to you,
until heaven and earth pass away, not the smallest letter or stroke shall pass from the Law
until all is accomplished. Matthew 5:18 (NASB)
Most people think there is only one - or at most two - sides to the Law of Moses: the 10 commandments and the sacrificial and dietary laws (ordinances). We all know about the blessings Israel was told they would get from keeping the Law. What most people don't understand is that there was a penalty for
not keeping it.
Those penalties are found in Deuteronomy 28 and Leviticus 26. For the sake of time and space, I'm not going to quote them all, but the verses from Leviticus 26 need to be cited again:
{14} '
But if you do not obey Me and do not carry out all these commandments,
{15} if, instead,
you reject My statutes, and if your soul abhors My ordinances so as not to carry out all My commandments, and so break My covenant,
{16} I, in turn, will do this to you: I will appoint over you a sudden terror, consumption and fever that will waste away the eyes and cause the soul to pine away; also, you will sow your seed uselessly, for your enemies will eat it up.
{17} ~
'I will set My face against you so that you will be struck down before your enemies; and those who hate you will rule over you, and you will flee when no one is pursuing you.
{18} ~'
If also after these things you do not obey Me, then I will punish you seven times more for your sins.
{19} ~'I will also break down your pride of power;
I will also make your sky like iron and your earth like bronze.
{20} ~'Your strength will be spent uselessly, for your land will not yield its produce and the trees of the land will not yield their fruit.
{21} '
If then, you act with hostility against Me and are unwilling to obey Me,
I will increase the plague on you seven times according to your sins.
{22} ~'I will let loose among you the beasts of the field, which will bereave you of your children and destroy your cattle and reduce your number so that your roads lie deserted.
{23} '
And if by these things you are not turned to Me, but act with hostility against Me, {24} then I will act with hostility against you; and I, even I, will strike you seven times for your sins.
{25} ~'
I will also bring upon you a sword which will execute vengeance for the covenant; and when you gather together into your cities, I will send pestilence among you, so that you shall be delivered into enemy hands.
{26} ~'When I break your staff of bread, ten women will bake your bread in one oven, and they will bring back your bread in rationed amounts, so that you will eat and not be satisfied.
{27} 'Yet if in spite of this you do not obey Me, but act with hostility against Me,
{28} then I will act with wrathful hostility against you, and I, even I, will punish you seven times for your sins.
{29} ~'Further, you will eat the flesh of your sons and the flesh of your daughters you will eat.
{30} ~'I then will destroy your high places, and cut down your incense altars, and heap your remains on the remains of your idols, for My soul shall abhor you.
{31} ~'
I will lay waste your cities as well and will make your sanctuaries desolate, and I will not smell your soothing aromas.
{32} ~'
I will make the land desolate so that your enemies who settle in it will be appalled over it. {33} ~'You, however, I will scatter among the nations and will draw out a sword after you, as your land becomes desolate and your cities become waste. Leviticus 26:14-33 (NASB)
With this passage in mind, look at Christ's words again:
until heaven and earth pass away, not the smallest letter or stroke shall pass from the Law
until all is accomplished
Then Luke again:
{20} "
But when you see Jerusalem surrounded by armies, then recognize that her desolation is near...{22} because these are days of vengeance, so that all things which are written will be fulfilled. Luke 21:20,22 (NASB)
Did God leave any unfinished business with apostate, 1st century Israel on the cross?
In other words, was there a part of the Law of Moses not fulfilled on the cross?
If yes, when was it finished? When was it fulfilled?
Now, notice one more curse in the penalty section of the Law:
I will also make your sky like iron and your earth like bronze.
The Greek words for "heaven and earth" in Matthew 5 are "ouranos" and "ges." These are translated elsewhere as "sky" and "land."
Coincidence?